12 - Pk. Carbon Express Blue Streak Shafts. Blue Streak"s the name, accuracy"s the game. Diamond Weave technology makes for a straighter spine for truer flight. Dual Spine Weight Forward technology adds fast recovery and guidance control to the mix. BullDog nock collar for extra strength and protection. +/- .0025" max straightness and weight tolerance of +/- 1.0 grains. Choose your size: 150 (6.5 gr / inch), 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 Shafts