Cartridge Bearing System- Lightweight and strong duraluminum alloy construc- Tange Seiki Original sized 4T5 Cartridge Bearings- Fully Sealed Mechanism- For 38mm OD (or inner diameter 34mm) headtube- For 1 1/8 " threaded forks- Cups: 34mm- Crown race: 30mm (inner diameter)- Stack height 34.5mm- Weight: 100g- Color: Silver (as pic. shown)- OEM package (This item is exactly as pictured and does not include retail package)