12 Carbon Express Blue Streak Select Shafts. Constructed with Dual Spine Weight Forward technology for fast recovery, guidance control and flight that"s flat and true. BullDog nock collar for added strength. +/- .001" straightness. Weight tolerance of +/- 1.0 grains. Choose your size: 250 (7.4 gr / inch) or 350 (8.3 gr / inch). State Size. Order Today! WARNING: You must be 18 or older to purchase this product. This product cannot be shipped to D.C.; MA; Canada or Puerto Rico. Please check your State, County and City laws for restrictions before ordering this product. 12-Pk. Carbon Express Blue Streak Select Shafts