Cut clay slabs into 4" tiles, strips, and rectangles in just a few strokes! First create a slab of soft clay, no more than 1/2" thick. Roll the cutter into the clay to the desired length. Roll again, perpendicular to the original cuts, to create tiles or rectangles. For best results, spray cutter lightly with non-stick cooking spray to avoid the possibility of clay sticking to the roller. To create nice "rounded" edges while cutting, lay thin plastic wrap on top of clay slab before cutting (no cooking spray needed). Roller measures 4" wide and is 5/8" deep. Made of durable plastic, it's safe for all ages.