This is the 2746 Metal Washers 3x6mm (12) from Traxxas. Traxxas has grown tobecome the number-1 selling name in RTR nitro and electric models for the last4 years running. No one has done more than Traxxas to advance the RTR categorywith innovative thinking and fun designs that make it easy for anyone to getstarted in the great R/C hobby. Traxxas truly the fastest name in RadioControl.