Cosmo Darts has succeeded in creating the lightweight shafts with high stiffness and strength that is comprised of reinforced plastic resin and high-strength carbon fibers. These shafts combine both the performance of lightweight plastic and the high durability of metal. It's now easier to tell between locked and spinning... Spinning shafts have a rounded top and Locked shafts have a flat top. Also, the top of the locked shaft is now in a matte finish