Bionic Swiss feature titanium ball bearings and utilize shields to protect the internal parts of the bearing against contamination by dust, and liquid. The shields help contain the lubricant in the bearing, are fixed to the outer ring and have a non-rubbing seal to the inner ring. Requiring no break-in period. Titanium ball bearings, Delrin cage 20% glass reinforced with extra deep grooves for increased longevity and low maintenance.