Bicycle Headset Bearing(also called AC bearing, ACB) MH-P16H8 with good rotation and application for 1-1/2" intergrated headset.
Bearing basice dimension: d 40 * D 52 * H 8 mm, 45 degree/45 degree, double seals.
Chrome steel 100Cr6 or Stainless steel SUS440 material for rings and balls.
Ceramic Si3N4 / ZrO2 balls is available.
Mobile XHP-222 or HTHS grease.