Alumicore Grips - TBW - Black Technically manufactured with a forged and CNC lathe-turned 6061-T6 aluminum tubing, Grips comprised of Thermoplastic Velcanizate (TPZ) rubber sleeve and installed over the tube's knurled surface for traction and comfort, Internal gear interface inside the AlumiCore grip for TBW is forged into the grip's aluminum sleeve, so it will break or disengage from the TBW module's gear interface