Product Details Chinook Xtra Durable Carbon 100XD RDM is the ultimate in materials, pre-preg construction, and performance.Lighten and liven up your rig with durability to inspire confidence. You will feel the difference.100% Carbon FiberConstant Curve2-PieceProvides excellent reflex response to maintain desired sail shape.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 3.35 lbs. or 1.52 kg 370cm 17 63B / 77T Constant Curve 3.55 lbs. or 1.61 kg 400cm 19 63B / 77T Constant Curve 4.30 lbs. or 1.95 kg 430cm 21 63B / 77T Constant Curve 4.54 lbs. or 2.06 kg 460cm 25 63B / 77T Constant Curve 5.27 lbs. or 2.39 kg