Bolt & socket-drive sprocketMaterial: 7075 T6 aluminumSize: 25t, 26t, 27t, 28tTeeth: 1/8"Bore (mm): 23.8Thickness (mm): 6.35Adapter: 19mm & 22mm includedExtra info: lightweight sprocket, runs directly on 24mm spindle, sinked adapter for better chain alignmentWeight (kg): 0.070 (25t)Color: black, gold, high polished, blue