External cup aluminium/steel headset for threadless 1 1/8" (28.6 mm) forksSize: 1 1/8" x 34 x 30For forks with outside diameter: 28.6 mm (1 1/8")For head tubes with internal diameter: 34 mmFor fork crown outside diameter: 30 mmFor stem inside diameter: 28.6 mm (1 1/8")Cartridge sealed ball bearings: CBB-418 (OD Ų41.8x45°x45°)6061/T6 CNC machined aluminium top cover and cupsSteel cold-forged crown race10 parts: crown race, 2 cartridge ball bearings, 2 cups, compression ring, upper seal, top cap, star nut, cap boltWeight: 112 gStack height: 29 mmPacked in a boxHeadset parts placing from the bottom: Crown race, ball bearings with seal down, lower cup, star nut, upper cup, ball bearings with seal up, seal, compression ring, top cap, cap bolt