If you"ve never experienced the improvement in ride quality a precision-engineered headset can make, you owe your bike an upgrade. Cane Creek"s new 40 Series delivers everything you should look for in a precision headset -- light weight, durability and silky smooth performance. American-made quality and a homegrown value, too. 6061 T-6 aluminum cups and covers are internally relieved to reduce weight 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 Durable steel crown races Dependable black-oxide, sealed bearings Interlok spacer compatible Internal parts are cross-compatible across the 10, 40 and 110 series Consistent top and bottom stack heights across 10, 40 and 110 series Cut and machined in the USA