This is top of the line Shock made from reputable FASTACE usually with over 1000 lb capacity, not those $30 mickey mouse shocks others selling. 12" FASTACE BF-A01AR Air/Oil/Coil Spring (300L*1000lbs) HIGH QUALITY ADJUSTABLE REAR ALUMINUM REAR SHOCK FOR 280 XR50 CRF50 XR CRF 50 70 PIT BIKE Brand New!! Never Been Used or Installed!! This item fits most Honda XR50, CRF50, similar China made pit bikes like 70cc,110cc, 125cc or 138cc. It is also be compatible with most SDG, Pitster bikes.! Light weight, ergonomic, adjustable rebound, easy turn adjustable spring pre-load, nitrogen-charged, oil damping with internal floating piston, service friendly This shock is ideal for bikes that have the stock style extended swingarms. The shock will double your travel and raise your seat height above 2". This is a quality rear shock and comes with AL6061 T6 forged shock body, easy-turn spring preload nut, oil damping with floating piston, preload and rebound adjustment. Upgrade for stock and replacement for SDG and other pit bikes, it is ideal for bikes that have the stock style extended swingarms. Recommended for riders up to 1000 lbs. Mode  Material  Surface Weight Length Stroke BF-A01AR AL6061 T6 forged aluminum body Dark hard anodized 1135g 300mm 70mm Specifications: Aluminum Alloy Spring is Adjustable HD Steel End Piece w/ rubber-metal bushings Length: 12" or 300mm eye to eye length *** shocks are non -returnable, while it fits most CRF/xr 50 style bikes, some year model may not fit without modification, your swing arm may not have enough clerance room for this size shock ( about 75 mm/3 inches diameter), please make sure this is the one you want by checking with your local dealer before bidding.