Features: 100% high modulus carbon fiber for strength and durability Designed with one objective - maximum speed and long-range performance in a small diameter arrow Small outer diameter for extreme speed and flatter trajectory Spine Aligned for increased accuracy and tighter grouping Nano Ceramic ICE© coating for greater speed, penetration, and easier removal from targets Specifications: Construction: 100% Carbon Fiber Inside diameter: 0.204” Straightness: +/- .001″ Weight tolerance: +/- 0.5 grains, sorted per dozen Quantity: 12-pack Available Spine Size (Weight): 200 (9.3 gpi) 250 (8.1 gpi) 300 (7.1 gpi) 350 (6.4 gpi) 400 (5.9 gpi) 500 (5.1 gpi) Includes: RIP SHOK Aluminum Insert (21 grains) IP Nock .204 (8 grains)