8 layers of woven carbon fiber making this shaft stronger than most. The Reign is our .204 hunting arrow that can reduce wind drift and increase penetration while maintaining extreme durability. nock and SS halfout 55 grain inserts included. 0.300 / 10.3 GPI / +0.003-0.001 straightness / .204 ID 0.350 / 9.5 GPI / +0.003-0.001 straightness / .204 ID 0.400 / 8.4 GPI / +0.003-0.001 straightness / .204 ID Remember, Flexem before you shootem!