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.Includes:4 2ba Carbon Shafts8 O-RingsIt’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 finishOnly work with Fit Flights