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Description: 1, length: 30 inches / 78 cm 2, weight: 570 grains / 37 g 3, Outer Diameter: 0.346 inches / 8.8 mm 4, feathers: 4 inches biomimetic adhesive plastic feather 5, arrow: replaceable (for any inch thread arrows) 6, aluminum seat: the aluminum insert Inch 7, arrows body material:7075-T6 aluminum space 8, arrow tail: the plug-nock 9, for 30 - 80 lbs compound bow,Spine 300 Package include:12pcs