Gold Tip Ballistic Bolt Shafts 22 in. 1 doz.. Straightness tolerance of +-.005" and weight tolerance of +-2 grains. Available in 20" or 22" lengths. Shafts are 8.5 GPI. Includes brass inserts moon nocks and flat nocks. Specifications for Gold Tip Ballistic Bolt Shafts: Manufacturer: Gold Tip Color: Black Fabric/Material: Smart Carbon Technology Quantity: 12 Diameter: 0.3 in Features of Gold Tip Ballistic Bolt Shafts GPI - 8.5 Length: 20" Straightness tolerance (+/-.5) Outer Diameter: .343" Inner Diameter: .3" Package Contents: Gold Tip Ballistic Bolt Shafts Half-Moon Nock Flat Nock 11 gr Brass insert Carbon bolts built to a weight between the Swift and Nitro to offer crossbow shooters another option for optimal performance. Straightness tolerance of +-.005 and weight tolerance of +-2 grains. Available in 20 or 22 lengths. Shafts are 8.5 GPI. Includes brass inserts moon nocks and flat nocks.