Diameter of mat is 16 3/4"
Contains a grid with lines every 1/4"
Has a 10" square on the mat for squaring up fabric
Has Martelli no slip Material on bottom of the mat
The Round-About Cutting Mat was designed for use with the Round-About base. It is available as a two piece set with the base. It is a different material than the Martelli commercial-grade mats, meaning that it is not self-healing and you can not iron on it. The mat has a get-a-grip material on the back side so you can use it with the base or in a stationary manner. It is also small enough to take with you on trips and use for classes.