Product Details 70% Carbon fiber RDM mast.Constant curve bend characteristics work perfectly with the majority of sails on the market.70% carbon content provides excellent reflex response to maintain desired sail shape. Full Texalium wrap protects carbon from UV and impact.Remaining composite material further increases durability.Color coded mast sizes.Bag & Shim sold separatelyChinook Full Year Warranty Item IMCS Stiffness IMCS Bend Curve Flex Type Weight 340cm 16 63B / 77T Constant Curve 3.85 lbs. or 1.75 kg 370cm 17 63B / 77T Constant Curve 4.2 lbs. or 1.91 kg 400cm 19 63B / 77T Constant Curve 4.8 lbs. or 2.18 kg 430cm 21 63B / 77T Constant Curve 5.35 lbs. or 2.42 kg 460cm 25 63B / 77T Constant Curve 6.2 lbs. or 2.81 kg