The best scooters on the market. Our spectrum scooters are made of a durable high-impact polyethylene with non-marring casters. Grasp inside the hand Protectors to shield fingers and hands from other scooters during play. 16 inch size. Wheels are 2 inch diameter and the bottom of the scooter sits approx. 2-1/2 inch off the ground. Don't pay a lot and still bring your "a" game. That's the spectrum difference. Spectrum products deliver superior quality at a price that's easy on your wallet. Tough enough for regular use in the gym or on the Playground, great for training, perfect for introducing kids to sports. And what a selection! get spectrum. And get playing!.