FSAs core line of headsets that have become an industry benchmark\nAll Orbit headsets feature forged and CNC machined 6061 T6 alloy cups
 Orbit IS, CF, Z, ZS, X, MX, XL II include angular contact bearings 
 Orbit Xtreme Pro include stainless steel industrial cartridge bearings and stainless crown race
 Orbit UF include lower angular contact bearing and upper 5/32 inch caged bearing
 Orbit DL include 5/32 inch caged bearings
 IS: 36x45 degree Cane Creek Integrated, CF: 45x45 degree Campagnolo Integrated, ZS: ZeroStack shallow, Z: ZeroStack deep, or Xtreme-Pro, X, MX, XLII, UF, DL: External Cup traditional available for 1 inch, 1-1/8 inch, tapered and 1.5 inch applications
 For clarification go to http://www.fsaeasyheadset.com