HDK-0022-S - Maxhit Zero-Stack/External Cup Headset Kit 1-1/8 x 1-1/2 (44/44mm)-Silver TH-873 Grade 25 would be considered

Grade 25 would be considered a very high grade ball

90% fill Kluber NBU52 grease only runs better and smoother with time and is highly resistant to being washed out

Static load -506lbf / 2

Enduro Zero Ceramic-Hybrid Bearings featuring Black-Oxide treated 52100 High-Carbon Chromium alloy races paired with Grade 5 Silicon-Nitride Ceramic Balls with 90% fill

Please note:

HDK-0022-S - Maxhit Zero-Stack/External Cup Headset Kit 1-1/8 x 1-1/2 (44/44mm)-Silver TH-873 Grade 25 would be consideredHDK 0022 S 1 1 8 x 1 1 2 stainless steel, Angular Contact, Zero Stack External Cup Headset Bearing Kit for 44mm 44mm ID head tube framesets Silver All Enduro Maxhit headsets are designed with a 36 inner race chamfer angle, along with a matching 36 upper compression ring and 36 lower crown race. When installed as a complete system, angle differences from your original equipment will not affect functionality as long as all included components are used