Cartridge Bearing System- Lightweight and strong duraluminum alloy construc- Tange Seiki Original sized 4T5 Cartridge Bearings- Fully Sealed Mechanism- For 34mm OD (or inner diameter 30mm) headtube- Cups: 30mm- Crown race: 26.4mm (inner diameter)- Stack height 35.3mm- Weight: 87g- Color: Silver (as pic. shown)-OEM package (This item is exactly as pictured and does not include retail package)