The Victory Vap-SS Elite line of arrow shafts is a micro diameter shaft with stainless steel layers infused into a 90 degree carbon fiber weave arrow that is lighter and faster with a higher FOC designed with accuracy and increased penetration. Features advanced 3K carbon weave for less torque, faster recovery, and tighter spine consistency. Has advanced Nano ceramic arrow coating that improves penetration and easy arrow removal. Straightness tolerance of +- .001 and weight tolerance of +- 0.5 grains. Available in sizes 250 (10.8 GPI), 300 (9.9 GPI), 350 (8.8 GPI), 400 (8.6 GPI). IP nocks and Shok TL aluminum inserts included. Factory fletched with 2 vanes. Specs: Spine: 350 Length: 31 Shaft ID: .0.166 Shaft OD: 350 - 0.234 GPI: (grain per inch)350 (8.8 GPI) 12 Shafts