Physics is usually boring. Honestly, most of us spent high school physics classes staring at the clock, waiting for the bell to ring so we could go literally anywhere else. But then Austin Hillam and Stephen Fazio showed up on a 2022 episode of Shark Tank with a device that makes invisible forces look like a magic trick. They called it ZipString. It’s basically a loop of string moving so fast that it loses its limpness and takes on a rigid, sculptural shape in mid-air.
You've probably seen the clip. It went viral before they even stepped onto the carpet. You might also find this related story interesting: The Kevin Warsh Doctrine and the Dangerous Mirage of Central Bank Unity.
The ZipString Shark Tank pitch wasn't just another toy pitch; it was a masterclass in how a simple "cool factor" can override the skepticism of billionaire investors who have seen every plastic gadget under the sun. They walked in seeking $100,000 for a 10% stake. By the time they walked out, they had something much more interesting.
The Science of the "Loop"
Let's talk about what this thing actually is. If you take a piece of string and throw it, it falls. Gravity wins. But if you move that string through a set of high-speed rollers, the momentum overcomes the gravity and the air resistance creates this weirdly stable "hull" shape. It’s a phenomenon often called string synthesis or simply "flying string." As discussed in latest articles by Investopedia, the results are notable.
Austin and Stephen didn't necessarily invent the physics, but they miniaturized it. They took what used to be bulky lab experiments or DIY garage projects and shoved it into a handheld device that fits in a pocket. It’s tactile. It’s satisfying. It’s the kind of thing you pick up "for five minutes" and realize an hour later you’re still trying to make the string loop around your cat's head without touching it.
The Sharks—Mark Cuban, Barbara Corcoran, Kevin O’Leary, Lori Greiner, and Robert Herjavec—are usually pretty jaded. They see "toy" and they think "inventory nightmare." But the ZipString Shark Tank demonstration changed the energy in the room. When the string started floating, the skeptical looks vanished.
Why the Sharks Brawled Over a Piece of String
Kevin O’Leary usually hates toys. He calls them "one-hit wonders" that end up in the "toy graveyard." But even Mr. Wonderful couldn't ignore the margins. The duo explained that the product was already blowing up on TikTok. We’re talking millions of views before they had even scaled up manufacturing.
That is the holy grail for a Shark.
When a product has organic "virality," the marketing budget drops to near zero. You aren't paying for Facebook ads; the kids are doing the work for you.
Robert Herjavec was the first to jump. He loved the simplicity. But then things got crowded. Most pitches on the show involve a lot of begging. This was the opposite. This was a feeding frenzy. Robert and Lori teamed up. They saw the "Hero" potential—Lori's specialty. If a product looks good on camera, Lori can sell it. And ZipString looks incredible on camera.
Ultimately, after some back-and-forth tension that felt more like a playground argument than a board meeting, Austin and Stephen accepted a joint offer from Robert Herjavec and Lori Greiner: $100,000 for 20%. They gave up double the equity they wanted, but they gained the "Queen of QVC" and the tech-savvy Robert.
The Reality of Post-Shark Tank Scaling
Getting a deal on TV is easy. Shipping 50,000 units from a warehouse in Utah is hard.
Most people don't realize that ZipString was almost a victim of its own success. After the episode aired, the "Shark Tank Effect" hit hard. Orders flooded in. But the world was still grappling with supply chain hiccups and shipping delays.
The founders had to move fast. They transitioned from 3D-printed components to high-volume injection molding. They had to ensure the battery life didn't suck and that the string didn't tangle every ten seconds—because if a toy is frustrating, it gets thrown in a drawer. They leaned heavily into the "community" aspect. They started showing people how to do "tricks."
- The "Cradle"
- The "lasso"
- The "long-shot"
By turning a physics toy into a skill toy (think yo-yos or kendamas), they extended the lifecycle of the product. It wasn't just a novelty anymore; it was something you could actually get good at.
Is ZipString Still a Thing?
It’s easy to assume these companies vanish once the credits roll. Many do. But ZipString stayed relevant by refusing to stop at the original model. They listened to the feedback. The early versions were a bit noisy. People wanted different string colors. People wanted more power.
They launched the ZipString Luma, which added LED lights into the mix. If you think a floating string looks cool during the day, seeing a glowing neon loop dancing in a dark room is a whole different level of aesthetic. This move allowed them to pivot toward the "festival" and "rave" crowds, not just kids.
They also realized that the educational market was a goldmine. Teachers started using ZipStrings to explain vectors, tension, and fluid dynamics. It’s a lot easier to teach a kid about centripetal force when they’re holding a literal physical representation of it in their hand.
What Most People Get Wrong About the Deal
There's a common misconception that once the cameras stop rolling, the check is handed over. In reality, "due diligence" happens. This is where many Shark Tank deals die.
However, the ZipString team was prepared. They had their patents in order. They had their manufacturing costs down to the penny. While the exact final terms of the deal—as is often the case with private venture capital—remain between the founders and the Sharks, the partnership with Lori and Robert became a public-facing success. You can find the product in major retailers now, which is the ultimate "we made it" metric for a Shark Tank brand.
Actionable Insights for Entrepreneurs
If you're looking at ZipString and wondering how to replicate that lightning in a bottle, there are a few non-obvious takeaways.
First, visual proof is non-negotiable. If you have to spend ten minutes explaining why your product is cool, it isn't cool. ZipString needed zero explanation. The moment the motor turned on, the value proposition was clear.
Second, leverage "unintentional" markets. Austin and Stephen didn't necessarily set out to make a tool for physics teachers, but when that market showed interest, they leaned in. Don't be so married to your original "customer avatar" that you ignore the people actually trying to buy your stuff.
Third, manage the hype. The biggest danger ZipString faced was the "fad" label. They countered this by building a brand around "wonder" and "skill" rather than just "cheap plastic toy." They kept the price point accessible but treated the engineering with respect.
If you’re interested in the gadget, the best move is to look for the "Luma" version or the newer iterations that have better motor balancing. The original models are great, but the engineering has come a long way since that 2022 pitch. Also, if you’re a hobbyist, pay attention to the string tension—the "secret sauce" is in how the string is joined. A knot will ruin the physics; it has to be a seamless weld.
ZipString isn't just a toy. It’s a reminder that even in a world of high-end VR and complex AI, people still just want to see something that defies their expectations of how the physical world is supposed to work.
Next Steps for Enthusiasts:
- Check the official site for the latest "glow" versions if you plan on using it for content creation; they show up much better on smartphone cameras.
- If you’re a teacher, look into their bulk educational kits which often come with lesson plans on Bernoulli's principle.
- Watch the original pitch again, but this time, don't watch the toy—watch the Sharks' faces. That’s what a successful "Hook" looks like in real-time.
