Quantity per pack 12
Our new Black Eagle R nock is made for all .204 ID shafts to include our Rampage, Renegade and Spartan with nock Collar all 100% carbon shafts. 
This new nock is made with precision accuracy in mind. With a smaller shoulder, round throat, it increases accuracy by bringing your bowstring closer to the the arrow shaft and allowing your bowstring to release smoothly shot after shot.
Weight is 7 Grains
Center Serving size for bowstring to fit perfect is .109-.110