This is the RPM True-Track Rear A-Arm Conversion for the TRA T-Maxx 2.5R & 3.3/E-Maxx 16.8. Composite construction, black in color Rugged durability and slop free movement Two Upper Arms Left and Right Lower A Arm Two Axle Carriers Two 4mm Hinge Pins Four E-Clips Two Aluminum Pivot Ball Set Screws Two Delrin Pivot Ball Bushing Cups Two 6x15mm Sealed Outer Bearings Two 12x21mm Sealed Inner Bearings Installing on the rear of the chassis Also available in blue (RPMC8096) tlw 2/15/08 ir/jxs updt jxs 09/12/11 &