Cartwheels' simple goal was to create unique wheels to grow the fingerboard scene. Since its creation in 2011, Cartwheels has continued to achieve this goal by using different wheel materials, including wheels with aluminum cores. The P5PROs are their latest wheels which still utilize their trademark aluminum core, but use a plastic and urethane blend that provides the smoothest ride in the lineup. The aluminum core locks the high quality Japanese bearings in place, no bearing slip!