Product Name : VITAVON  Drive Cup 45# HD Steel 4 Slots Sells As A Pair For Traxxas XRT X-MAXX 8S 
Brand : VITAVON
Color : Black

Increased the dia of the shaft and drive cup are made of 45# steel with hardened treatment , 4mm slot fits for 4mm pin. for XMAXX 8S running.

4slots for double times use.

Sells as a pair.