The Superdrive 23 is a high performance, light mass, high strength all carbon shaft using Easton Superdrive construction. The Superdrive 23 provides precision, speed and strength for shooters looking for a complete range of spines shooting high performance 3D and indoor competition bows. Includes nock bushings, all other components sold separately. Straightness tolerance 0.003â?쳌. Available in spine sizes 325 (7.43gpi.), 375 (6.97gpi.) and 475 (6.35gpi).