These wheels are 57mm x 30mm and 101a
	
Roller bones team wheels have proven competition shapes poured in a high rebound, easy to ride, medium hard, long-lasting formula
	
This technology costs a little more but if you need the ultimate in roll, grip and wear, this is the wheel for you
	
This material was developed by Roller bones & introduced in the early 1990's
	
It has been copied but not duplicated, making this wheel & urethane unique