AR330451 Composite Shock Parts/O-Ring Set (2)This composite shock part and O ring set provides a collection of shock absorber spare parts for your RC tool box. Includes 2 x O Ring Spacer 2 x Shock Piston 2 x 7mm Pre Load Spacer 2 x 5mm Pre Load Spacer 2 x 3mm Pre Load Spacer 2 x Shock Cartridge 2 x Spring Location Ring 2 x Shock Cartridge Top 2 x O Ring 8 x 1. 5mm 4 x O Ring 2. 6 x 2mm Features Tough composite material for long lasting durability in all conditions Precision manufactured shock