Ritchey:

For bikes featuring integrated headsets (such as the Ritchey Road Logic and Swiss Cross), the Classic Integrated IS Headset stands above all others. This alloy beauty features full-complement stainless steel angular contact cartridge bearings packed with Ritchey high-webbing grease. Wrapped in our timeless high-polish finish, the Classic Integrated IS Upper headset adds that classy detail your bike deserves.

Material: alloy
Stack height: 9.1mm
Headtube ID: 42.0mm
S.H.I.S.: IS42/28.6 (1 ?)
IS42/28.6 (1 ?) bearing: 41.8/30.5/8mm 45/45 – sealed cartridge (ACB)
Top cap included
Weight: 42g
Colour: high-polish silver