Check the listing for details. Wolf Tooth Premium Headset - ZS44/28.6 Upper, 6mm Stack, Blue. Color: Blue, Condition: New. Listed at 64.95 USD. Wolf Tooth Precision Headsets are machined in the USA out of aircraft grade aluminum with superior sealing for protection against the elements. These ZS headsets are for frames with internal bearing cups that are pressed into the frame. Enduro stainless steel sealed bearings. Signature 5 mm integrated spacer plus stem cap with an aluminum bolt and a star nut. O-ring seal prevents water intrusion around the steerer tube. Custom molded upper lip seal provides additional protection for upper bearing. Item Specifications: Bearing Type, Cartridge, Color, Blue, S.H.I.S Upper, ZS44, S.H.I.S. Stem Clamp Diameter, 28.6 Threadless, SHIPS TODAY! Order before 1:30PM EST, M - F, and this item ships the same day! HAVE A QUESTION?Expert customer service by bike experts! A Real Brick And Mortar Retail Bicycle Shop with people you can talk to! Contact Us! (9-5 Mon-Fri, 12-4 Sat & Sun EST) Chat With Us