High-quality bumper plates used in KidStrong training centers are now available for use at home! Durable rubber protects floors and low profile enables stacking for storage. Conveniently sold in single plates to allow families to mix & match and use to load the KidStrong Krawler. This product is a general use product which, among other uses, can be used with the KidStrong Krawler on a flat surface. Krawler sold separately.