Apple Pie Memories 6-Inch by 6-Inch by 1/2-Inch Acrylic Stamp Block with Alignment Grid This acrylic stamping block is made for use with clear stamps The great advantage in using see-through crystal-clear acrylic stamping blocks for unmounted stamps is that you can see exactly where you are placing the stamped image on your work Features 6 by 6 alignment grid with 0-1/2 thick laser polished rounded corners and beveled edges