The Martelli 16" round cutting mat uses a high quality commercial grade material that makes it the most durable, cutting surface on the market. Designed for use with the Martelli Turntable base. This mat is perfect for squaring up quilt blocks and trimming flying geese units, you don't have to lift the block up just turn the mat. Also included in this bundle the turntable which serves as a base for Martelli's 16" Round Table-top cutting mat. 30 stainless steel ball bearings mean great durablility and no maintenance.