3/Pkg-.5" Thick, 1.25"X1.25", 2"X2", 2.5"X3.5". A set of 3 acrylic stamping blocks for use with clear stamps. sizes 1.25x1.25 2x2 and 2.5x3.5. all have 0.5 thick laser polished rounded corners. 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 made in usa.