The W R Memory Keepers Tri-Fold Magnetic Mat folds in three for easy storage. It comes in inches and centimeter measurements on a self healing surface. The mat measures 16" x 20" on non-skid foam pads on the back to keep it in place during use. It folds down to 16" x 7" for ease of storage. The package also contains a 15" long magnetic ruler. Non-skid foam pads on the back keep it in place during use.