The Cane Creek 40-Series sets the standard for performance, durability, and value. The 40-series draws from the premium 110-Series design, incorporating the features that provide a durable, lightweight, long-lasting headset.The Forty IS41 Upper assembly features an ultra-lightweight design. The tall top cover boasts a 15mm stack height, and is constructed of lightweight, durable aluminum. The top cover is paired with an alloy compression ring and a sealed black oxide bearing for exceptionally smooth performance. The Forty IS41 Upper is designed for performance, offering an ideal solution for any rider.New, Never Used, OEM, This item is exactly as pictured and does not include retail packaging.Specifications Model: IS41 Upper Headset Type: IS - Integrated Head Tube Inside Diameter: 41.1mm Head Tube Outer Diameter: 45.5mm Stem Clamp Diameter: 28.6mm Top Stack Height: 15mm Upper Cover Material: Aluminum Upper Cover Color: White Upper Bearing Type: 40-Series Black Oxide Upper Bearing Outer Diameter: 41mm Upper Bearing Inner Diameter: 30mm Bearing Inner Angle: 36 Bearing Outer Angle: 45 Bearing Height: 6.5mm Weight: 35g