Designed with a 5MM carbon core and XX75 outer shell, the Easton 5MM Full Metal Jacket Arrow offers hard-hitting speed and deep penetration that will drop big game in its tracks. Each Arrow comes pre-installed with 5mm X HIT Inserts and X Nock. High-strength carbon core with 7075 alloy metal jacket Pre-installed X nock 5MM (X) HIT Insert .002 straightness tolerance Your choice of size: 300 Product Features Shaft Weight: 12.0 GPI Spine @ 28" Span: 0.500" RPS Point: 9/32 Broadhead Adapter Ring: BAR5 Inside Diameter: 0.204" Length: 32.5", but can be custom cut by Sportsman s Guide to your desired length