Alphabet Reverse Stencil Clear Stamp by River City Rubber Works Set Of 27 Each Letter Measures approx 1"h by 5/8"w Clear stamps are so easy! The best part is that you can see through the stamp! With clear polymer stamps, you simply peel the stamp off the acetate sheet and the stamp will cling to an acrylic block! It's so easy! Use them like any other stamp, then clean them as usual while the stamp is still on the block! When you're done, peel off the clean stamp and return it to the acetate sheet!