The world's greatest experts from NASA and beyond don't even know how it works. The X-Zylo Ultra is the "flying gyroscope" that can travel the length of two football fields. It's the ultimate game of catch. Having swept the nation by storm, the X-Zylo has been featured in some of the country's highest profile media outlets. And if you can't get enough of it, there's a glowing X-Zylo Night version, so that the ultimate game of catch can be played at any hour.
— "One thing we've done well with are the X-Zylo products from William Mark. It's this thing that you throw. They call it the flying gyroscope. You can throw it a long way. They have different kinds of shooters. I just had to reorder them," said Mary Sisson, owner of Kazoodles in Vancouver, Wash.
— Two of 37 retailers told TDmonthly in March 2010 that William Mark supplies their top-selling outdoor items.