From OLFA®, this durable mat absorbs cuts made by both rotary cutters and art knives (straight utility knife blades) and folds flat for easy portability! The wavy fold line creates a smooth, gap-less surface when laid flat (won�t skip threads when cutting directly over fold). Padded, non-slip backing, 2.5mm thickness. Size when open: 12.75 in. x 18 in.; size when folded: 12.75 in. x 9.125 in.