TREK MASTER shocks by Tokico specifically provide proper damping control for trucks and SUVS. Taking technology from the HP Series, the TREK MASTER combines Tokicos multi-stage variable-aperture piston and sandwich valve system, with a new base valve design that provides four stages of compression cycle. In addition, the TREK MASTER utilizes a new deflective disc bottom valve that results in an incredible combination of handling, stability, traction, and ride quality not experienced with other truck shocks. In addition to the very sophisticated damping system, TREK MASTER shocks feature a low mechanical drag rod guide and piston seal design. The result is a shock with up to as much as sixty five percent less mechanical drag than other shocks. TREK MASTER shocks provide enough compression dampening to keep the tires and wheels on the road, but not so much that traction and ride quality suffer. The result is longer shock life, good adhesion, and low impact harshness for better ride quality.