For the ultimate in control and performance the Zone Offroad twin-tube, 10-stage velocity sensitive valved nitro shock is an excellent choice. The heavy chromed 5/8"rod with a 1-3/8" Fluon banded piston and double welded ends provide excellent performance. The full displaced valving offers a better valving range on both the compression and extension travel. Pressurized with nitrogen gas to ensure split second response and reduced aeration. All Zone Nitro shocks come with a Limited Lifetime Warranty.