Bones swiss labyrinth 2 bearingsbones swiss l2 labyrinth 2 the new bones swiss l2 bearings feature a new shield that reduces drag and increases the overall speed of the bearing the bones swiss l239s have a new redesigned inner race and two new labyrinth shields to keep the dirt out longer but still allow easy maintenance when necessaryfeaturesdouble labyrinth non contact removable rubber shields allow easy cleaning and low frictionhigh speed nylon ball retainer provides added speed and