December 22, 2012
Standard issue on XT cranks. Decent seals and smooth bearings.
One use only means another pair needs to be purchased if you ever plan on moving the crankset over to another bike.
Good external bearings. The seals do a good job of keeping grime and funk out. The bearings can be regreased if you have a steady hand and a sharp razor knife. Just be careful not to knick the rubber seals.