Self-healing, 12″ x 18″ cutting mat that can be connected to additional UltiMAT connectable mats for unlimitied width and length possibilities. 3 ply, 3mm thick and extra durable. Self-healing with a non-glare surface. Easy and fast to connect/disconnect. Postable size is easy to carry or store. Mulitple size combinations will fit most working table sizes. Imperial measurements. Mat: 12″ x 18″ (31 x 46 cm). Grid: 11 1/2″ x 17 1/2″ (29 x 45 cm)