"The Proof Research Bolt-Action 26"" Sendero Profile Carbon Fiber Barrel Blank provides tack-driving accuracy and extreme temperature resistance in a lightweight package. The Barrel Blank features a steel core wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin, creating a barrel that's up to 64% lighter than traditional steel barrels of similar size and contour. Each Proof Research Barrel Blank can be finished to standard or custom wildcat chambers. 26"" long, 1:8"" twist rate. Sendero profile. Steel core wrapped in aerospace-grade carbon fiber Extreme accuracy and temperature resistance Up to 64% lighter than traditional steel barrels of the same size/profile 26"" long 1:8"" twist rate Sendero profile"