Cane Creek's 40 Series Headsets are the work-horse of Cane Creek's headset line-up and incorporate all the features necessary for a durable, light-weight and long-lasting headset while offering the perfect balance of strength, durability and value. Features: Contoured and relieved 6061-T6 aluminum for minimized weight and maximized strength with split-lip sealed stainless steel bearings Low friction, dual-seal crown race and top cover provides maximum sealing from contaminants Captured compression ring design for carbon steerer compatibility (Interlok spacer compatible, sold separately) Internal parts are cross-compatible across the 10, 40 and 110 series Specifications: SHIS: ZS44/28.6|EC49/40 Fits: 1-1/8" Top, 1-1/2" Bottom Stack: 8mm/12mm Color: Black Weight: 137g