The Gumball is the number 1 roller derby toe stops in the world. The Gumball was designed and made specifically for roller derby.The Gumball toe stops is made of natural rubber and aluminum stem to reduce the weight.The Gumball toe stops have the perfect balance of grip and durability for quick stop and fast starts.The Gumball toe stops will be perfect for all surfaces from wood, sport court, polished and unpolished concrete, bank tracks and outdoor skating.The Gumball come in 2 sizes of stem. Long and Short stem .All the Gumball are guaranteed to Not pop off the stem doe to a very innovate design that is wider than standard heads and allows for the stem and rubber to be integrated.