Arrow Specification: Shaft Material: Carbon Shaft length: 16" 18" 20" 22" for your choice Inner Diameter: 7.6mm/0.3" Outer Diameter: 8.8mm/0.346" Point Weight: 125 Grain Point Material: Stainless steel Nock: Plastic moon nock Quantity?Pack of 12 User Notice: 1.Warning?check for damage before each shooting 2.Do not shot against concrete wall or any hard substance. This may damage the arrows. 3.The vanes may be bent because of long way transportation,but it can recover by using an air dryer or soaked in hot water for a while.