For years we folded our pit mats and complained when setting up our pits at each travel race about the folds and creases in the mat that never wanted to sit flat. So then we started to tie the mat into a roll which led to these pit mat rings. Designed around the 1Up rubber mat, but compatible with 99.9% of textile rubber/foam pit mats, two of these slide easily over the mat keeping it from unrolling and thereby eliminating the folds in the mat from storage and travel. Thich enough to be strong, yet thin enough to flex and not break. Sold 2 to a set.