This OLFA fabric cutting kit pairs a 45 mm quick-change rotary cutter with a self-healing mat for quilting and sewing preparation. The set includes a 12 x 18 in (30.5 x 45.7 cm) double-sided rotary mat plus a cutter designed for right- or left-handed use to support straight, measured cuts. Cut on the mat to protect your work surface and help extend blade life, then engage the blade cover when storing the cutter.