Solid and strong high quality headset with ball bearings ideal for aggressive riding. Both cups made from heat treated 4130 cro-mo steel. The top seal is made from 6061 alloy for weight savings. Lower cup has the same standard 5/32″ ball bearings as the top cup (easy to replace and available in every bicycle shop). Star nut included.
Features::

Ball bearings: 2x 5/32″ x 22 pcs Diameter: 1.125″ (1 & 1/8″) Steel cups & crown race, alloy top seal Weight: ~115g + star-nut ~22g