Square Anti-Shock Frame Base is one of NAGIC exclusive items. There are two main advantages over other mat keepers in the market. First of all, It is made by 100% hard PU foam, but normal heavy rubber. As a result, it's lighter. Second, you can disassemble it into 4 pieces and pack in a carton for transporting, so it not only takes less space of warehouse but easier for shipping. Most importantly, with NAGIC hard foam technology, this mat keeper is long-lasting and durable even outdoors. Other than those traditional rubber mat keepers, you now have one better option. Specification: 1. Fit for 1.5x1.5m range mats 2. Easy-assembled 4 pieces design for easier transportation 3. 100% PU and weighted only 11.2kg 4. Designed drain holes without standing water problem 5. Product size: 1590 x 1590 x 32mm 6. Patent protected, NAGIC exclusive items