Pig DHPro features angular contact sealed upper bearing and an industrial cartridge sealed bearing with an alloy upper cup and CrMo lower cup \n Pig features oversized 1/4" lower ball bearings, 5/32" upper bearings \n Big Fat Pig features super oversized caged ball bearings \n Pig: External Cup, traditional \n For clarification go to http://www.fsaeasyheadset.com