Wolf Tooth Performance Headset - EC34/30 Lower, Raw SilverWolf Tooth Performance Headsets are machined out of aircraft grade aluminum and assembled with Black Oxide Cartridge Bearings, balancing quality and price. Black Oxide Bearings are made from chromium steel for high load capacity and durability Custom molded dual lip seal on the crown race to protect lower bearing in the toughest conditions Product Specifics Lower Stack Height: 12. 25 S. H. I. S Lower: EC34 Color: Raw Silver Bearing Type: Black Oxide