Nockturnal FIT Universal Size Orange Lighted Nock - 3 Pack - Designed to fit nearly every hunting arrow on the market the Nockturnal Fit non-strobing base nock will fit X-diameter arrows, and each three-pack of Fit nocks includes three sets of Nock Collar adapter sleeves to fit GT, S and H arrows. Each Fit nock features ultra-strong, impact resistant, clear polycarbonate nock construction encapsulating two brilliant LED lights that alternate after engagement by the patented string-activated, piston-driven linear contact switch. Features Super Strong Clear Polycarbonate Construction; Available in Strobing or Non-Strobing Versions; Available Colors: Red/Green, Blue/Green, Red/Blue, Red, Green, Blue, Orange, White; Fits X, H, S, and GT Arrows; 20+ Hour Battery Life; 3-Pack; Improved LED's in your Red, Green and Red/Green Strobing nocks;