Manufactured through a stress-free Advanced Rotational Molding™ process (with up to 50% recycled content), these units feature superior strength-to-weight ratios not found in standard injection-molded carts. Being virtually maintenance-free, they also feature Rugged Rim® construction with bottom wear strips for additional strength. Plus they're compatible with automated and semi-automated lifters as well as stackable. Lids included. Greenstone.