Arrow Specification Shaft length: 16" 18" 20" for your choice Inner Diameter: 7.62mm/0.3" Outer Diameter: 8.8mm/0.346" Shaft Material: Carbon Complete Bolt Weight: About 364 grains(16 inch), 385 grains(18 inch), 402 grains(20 inch) Point Weight: 100 Grain Point Material: Stainless steel Nock: Plastic moon nock 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. 4.The use of an overdraw significantly increases the risk of injury to the shooter.