AR330531 Shock Parts/O-Ring Set (2)This composite shock part and O ring set provides a collection of big bore shock absorber spare parts for your RC tool box. Includes 2 x O Ring Spacer 2 x Big Bore Shock Piston 2 x 7mm Pre Load Spacer 2 x 5mm Pre Load Spacer 2 x 3mm Pre Load Spacer 2 x Big Bore Shock Cartridge 2 x Spring Location Ring 2 x Big Bore Shock Cartridge Top 2 x O Ring 13x1. 5mm 4 x O Ring 4x2mm Features Tough composite material for long lasting durability in all conditions