These are optional Pro-Line Powerstroke Front Shocks for use on the Traxxas Slash, Slash 4x4, Stampede, Associated SC10, HPI Blitz and Kyosho Ultima SC vehicles. **The Associated SC10, HPI Blitz, Traxxas Stampede, and Kyosho Ultima SC** **require the 6063-05 Universal Shock Mounting Kit, PROC6079.** **The Traxxas Slash and Slash 4x4 do not require the Shock Mounting Kit.** FEATURES: Dual-stage spring rate Injection molded spring retainer and shock ends Aluminum body and shock cap 3.5mm shock shafts Bladder sealed shock cap (easy to bleed) Free flow molded pistons Nitrate coated shock shafts INCLUDES: Two pre-assembled front Powerstroke Shocks REQUIRES: Shock oil Installation on vehicle SPECS: Length: 98.5mm (3.88") Spring Diameter: 19mm (0.75") lmm 02.02.10 ir/jxs