The No-Slip Material On The Back Of This Cutting Mat Allows For This Accessory Piece To Be Used In Conjunction With Our Round-About Base (Sold Separately). It Features A Padded Base Layer With A Self-Healing Cutting Mat Surface. This Package Contains One 16 Inch Diameter Cutting Mat. Grid Measurements Are In 1/4 Inch Increments And Includes Both 45 And 6 Degree Angle Lines. Imported., 1 Pack of 1 Piece