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NiNjA Performance Skate Products: are based in Japan and was founded by engineering skaters and skaters with a passion for the ultimate skateboarding experience. With some of the world’s finest testing equipment and some of the best skaters, they examined a large range of materials including ceramics for the inner and outer rings, various ball and retainer configurations, and shield materials and configurations before settling on the present design. The result is the NiNjA line of bearings that are proud to claim to be the world’s finest quality and highest performing skate bearings for your hard earned money.