VERSATILE STOPPER FOR ANY SURFACE - The VAKA Roller Skate Toe Stopper uses a PU rubber that can grip on any surface, from wood to asphalt.FeaturesVERSATILE STOPPER FOR ANY SURFACE - The VAKA Roller Skate Toe Stopper uses a PU rubber that can grip on any surface, from wood to asphalt.LASTING MATERIAL..