GO! Rotary Cutting Mat – 18″ x 24″ is a self-healing, double-sided, ultra-thick mat (3mm) and can be used with the GO! Rotary Cutter – 45mm for pre-cutting fabric strips for use with your AccuQuilt GO! Fabric Cutting System. The mat features gridlines with inch, cm, 30°, 45° and 60° angle markings.