Specifically for ARRMA-1/8 NERO 6S BLX AR106011/AR106009 and 1/8 FAZON 6S BLX AR2, these GPM aluminum and Delrin collars are designed to minimise lateral movement in front and rear knuckle arms. The combination of metal and Delrin materials provides durable location with controlled compliance, improving steering consistency and quicker mechanical feedback for performance tuning.