The popular dual color knobby mat is now available in metal detectable material. Metal detectable mats are differentiated with a third die-cut hole. One side of the mat issolid black, while the other is a solid color to easily identify product and non-product surfaces. Formulated with FDA approved materials. Features three 3/4" reinforced die-cut hanging holes for use with stainless steel mat hanger (#141-2200). 21" x 27".