Top quality headset with zero stack (semi-integrated) top and bottom parts. ZS44/ZS56 S.H.I.S. type. Cups and ultra low profile top cover are made of aluminum. High-quality precisionsealed 45/45 bearings with anti-rust titanium coating and special high-density grease protecting against water penetration. They come with two alu 7075 crown races, one for tapered 1.5" and second for 1-1/8” forks.