The bearings are sealed and thus

Pack contains two top bushings

providing better response and control

they are relatively inexpensive

Sonic Turbo Wash Bio for Bearings Pig The bearings are sealed andMAKES BEARINGS SHINE FOR A FASTER, SMOOTHER ROLL Similar to the original Turbo Wash but filled with Sonic Bio Cleaner 100% biodegradable, non toxic, low VOC, plant based formula COMPACT BUT MIGHTY Washes up to 16 bearings in one load No need to install bearings on a rack which holds only 8 bearings 2 loads needed Just like clothes in a laundry machine, the agitation of the loose bearings promotes cleaning Loose bearings wont get damagedtheyre made of