The fun begins with Spinnyos YOs. What are YOs and what makes them go? They're cool, round things that love to spin fast and love to spin slow. These YOs love to race and chase as they spin. Ready, set, YO! Which one will win? Preschoolers find out when they take their YOs to the Racin' Chasin' Super Slide! It's side-by-side racing fun on two parallel tracks - or chase-and-race action on the same track! Kids can even customize their YOs with special "hub caps" to put their own spin on the fun! Ready to race? Kids just load up their YOs at the starting gate, press down on the launcher and on their marks, get set, YO.the topsy-turvy gravity-defying race begins! Take the YOs for a ride.make them slide.go upside down.and 'round & 'round & 'round & 'round. It's a whole spin on defying gravity! The first YO that crosses the finish line and pops up the flag is the winner! There are even 3 barrels to set up and crash through at the bottom! Race up to 4 YOs at a time - 2 are included, additional YOs are sold separately. How do YOs stay on the Racin' Chasin' Super Slide track? Well, it seems like magic, but actually, there's a kid-safe magnetic axle inside each YO that attaches to the metallic edge on the track. They're so much fun that once kids start spinning 'em, they won't want to stop! (You won't either-try 'em and see for yourself!) They're YO-tally awesome!