1.59 x 2 in
There is a plastic film protector to peel off before use! We get ours off by picking it at the edge. If you have trouble, here are other ways:
Using a hairdryer on a low-heat setting for 10 seconds can loosen the adhesion, making the film easier to peel
Place a piece of tape on top of the item, then peel it off slowly from the edge.