The Arma MX V3 is a direct bolt-on replacement for the Sur Ron Light Bee X and Talaria Sting. No additional Hardware is needed, simply bolt-on and go. Shock will be pre tuned by EXT-USA on the information you provide.    Engineered with performance and control as primary objectives, the shock structure has seen a redesign in order to be more robust. The Hydraulic Bottom-Out Circuit (HBC) has been enhanced with a wider range of adjustment, in order to prevent bottom-out issues, while allowing riders to use softer spring rates and providing excellent support and end stoke characteristics.Please allow for 7-10 business days on this product thanks! The Arma MX includes the following features 4 way adjustable: LSC-HSC-LSR-HBC (Hydraulic Bottom-Out Control) High flow 29 mm main piston 24 mm valve piston 14 mm shaft (50% larger than most other coils on market to help deal with large side loading events) Engineered rebound circuit to separate bump and rebound oil flow – Ultra low-friction coating User adjustable HBC technology Very low reservoir pressure for maximum sensitivity  and low cavitation(55 PSI) Full custom hydraulic setup that is bike and rider specific for each shock Very low hysteresis for high dynamic response High turbulent flow for progressive dampening and mid stroke support Low friction seal Thinner bottom-out bumper and debris clearing washer New low profile rebound knob for easy spring swap Included with 1 light weight spring available in 400lb, 450lb, 500lb, 550lb or 600lbs (Lower options may be available upon request) Comes with specific mounting hardware for easy bolt in instillation.  *This is a special edition shock that will be built in limited runs. Spring Guide Rider Weight Spring Up to 140 400 140 to 180 450 180-210 500 210-240 550 240+ 600 Note: This table is a generalguide. ALWAYS FACTOR IN YOURSELF WITH ALL GEAR!For firmer or softer preferenceselect a spring weight above or below.Feel free to contact us with questions. Warning: Please refer to the Sur Ron guidance regarding maximum weight limit for the bike.