Name: 4456ST Bicycle Headset Integrated System (IS) ZS44/28.6 ZS56/40(30) Material: CNC Aluminum Alloy Sealed Bearing Weight: About 126 g Color: Black,Red,Blue Package includes: 1pc 4456ST Bicycle Headset Note: '44' for OD ø44,'56' for OD ø56,'S'for Straight Tube ,'T' for Tapered Tube fork. Durable bearings, waterproof design 45 degree design , Special Sealed bearing for headset. waterproof design keep your steering smooth and long life. Precise CNC manufacturing, minimum stack height.