Maker has golfmechanix manufacturing company ยท Plastic Fabric 2 piece set Total length: 128 mm (50 mm port part) Outer diameter x inner diameter (Butt side): 15.4mmx12.5 mm Outer diameter x inner diameter (port side): 12.5mmx6.5 mm Carbon shaft for: ADHESIVE ON THE PORT SIDE after you adjust the weights in the pictures The maximum extension length: Approx. 3 = 76.5 mm Main product weight: about G The price is for set of 2