Cane Creek 40-Series Traditional Headset Durable black oxide steel bearings for long life 6061-T6 aluminum cups are internally relieved to reduce weight Cane Creek's innovative Clip-Seal completely seals the top assembly and captures the compression ring to reduce the number of loose parts High-quality, low friction face-seals on the crown races Internal parts are cross-compatible across the 10, 40 and 110 series