Luigino Bearings optimize speed and longevity by specializing in skate bearings. We take pride in designing bearings that meet the demands of hard core derby skaters looking for more speed as well as a bearings that require low maintenance and have superior longevity. Shields are used to protect the internal parts of the bearing against contamination by dust, and liquid. The shields help contain the lubricant in the bearing. They are fixed to the outer ring and have a non-rubbing seal to the inner ring.