Features ritchey standard logic headsets lightweight precision machined aluminium cups logic smaller upper scale angular cartridge bearing saves weight larger lower bearings boosts strength and durability uses ritchey grease and sealed design for years of trouble free performance supplied with high quality alloy top cap and star nut anodized black finish fits standard 118 headtubes ball bearings headset specs upper shis ec34286 lower shis ec3430 if unsure about shi