Originally Posted by HillRider

Cartridge bearings are usually sealed and the Pig DH has sealed cartridge bearings both top and bottom. "Caged" bearings are just loose balls in a retainer and are not the same as cartridge bearings and are not sealed. The regular Pig does have these so your friend wants the Pig DH. Also FSA Orbit X and Orbit XLII headsets have sealed cartridge bearings and are a bit lighter.