STRC CNC Machined Threaded Aluminum Front Shock Body Set 1 pair Slash 4x4 & Slash 2WD (blue) The CNC Machined Aluminum front racing shock sets feature threaded aluminum shock bodies with O-ring installed pre-load collars in which the O-ring secures your pre-load adjustments in place. Threaded shock bodies allow for very precision ride heightspring pre-load adjustments, while the shocks also features aluminum lower shock caps to keep the shock cartridge straight and flex free during suspension operation and heavy suspension compression. Also works on Slash 2WD Short Course Truck