The 12" x 12" high tempered glass with grid lines allow for precision cutting every time. Simply flip the mat over to emboss on the Slice 12" x 12" foam embossing mat. High powered magnets work with the collar to hold the Slice Fabrique in place "Hands Free" while it cuts. Overall size is 13 3/4" x 13 3/4" and 1/4" thick.