Carbon Express Nano SST, Ultra-Slim Recurve Carbon Target Arrow Shaft (Designed for FITA, NAA and NFAA), 12-Pack ULTRA SLIM DESIGN - The new Nano SST is an ultra-slim diameter shaft designed specifically for recurve bows. This design dramatically reduces cross-wind drift and is the ideal arrow for FITA, NAA and NFAA long-distance field shooting. ENGINEERED FOR SUPERIOR CONSISTENCY - Engineered for optimal velocity, strength and consistency, the Nano SST is constructed from 30-ton carbon so it will not take a set (permanent) bend TRI-SPINE TECHNOLOGY - With three specific spine areas with the stiffest being in the mid section of the shaft and the weakest spine configured to the back-end to allow for proper fletching clearance through the shot on a recurve bow. MINISCULE MARGIN OF ERROR - The Nano SST is laser check for a straightness of  0.002", a spine selection tolerance of  0.002", and a weight tolerance of  1.0 grains. ITEM SPECIFICATIONS: 500-Size, 8.18-GPI, 32" Length, 0.500" Spine, 0.219" Diameter, and 5.4 Beitner Outnock