Easton’s 4mm Procomp Arrow Shafts deliver maximum performance and quality at an unbeatable price! These shafts are made for archers trying to boost scores and at competitive and club-level events, and utilize a lightweight, high-speed parallel design. The 4mm Procomp shafts are constructed using Easton’s exclusive, high-modulus carbon and super-strong alloy core construction. In addition, the Procomp Shafts are compatible with most of Easton’s 4mm components such as direct-fit G-nocks and Deep-Six nocks (recommended for high-energy compound cam systems. Specifications: High-strength carbon fiber bonded to a 7075 alloy core Straightness: +/- 0.0015 Weight Tolerence: +/- 0.5 grains Parallel Design 4mm Microlite nocks included 4mm 8-32 aluminum half-out inserts included Easton Procomp Size 420 Shafts 12pk 828463 in Black