DAFA Professional 36" x 24" Self-Healing, Double-Sided Cutting Mat, Rotary Blade Compatible, (36x24), (24x18), (18x12), (12x9) Sizes, for Sewing, Quilting, Arts & Crafts Professional-quality, double-sided self-healing cutting mat has easy to read metric gridlines & angles on one side and imperial (inches) gridlines & angles on the opposite side Great for quilting, sewing, scrapbooking, arts and crafts, DIY projects or use as a desktop mat or protector Durable 3mm, 3-ply construction for heavy duty cutting, compatible with rotary cutters and straight blades Non-slip, self-healing finish reseals surface cuts, providing a continually smooth surface for all cutting projects. Ships flat, stays flat. Our mats resist curling and warping Please note: for ease of comparison, mat sizes are rounded to the nearest inch. Exact sizes (edge to edge) are as follows: A1(35.5in x 23.6in, 900mm x 600mm), A2(23.6in x 17.7in, 600mm x 450mm), A3(17.7in x 11.8in, 450mm x 300mm), A4(11.8in x 8.7in, 300mm x 220mm).