INKADINKADO-The Clear on Clear System makes stamping easy! Stamps and blocks are crystal clear so you can see where you are stamping. Stamps cling like magic, easy on, easy off--no adhesive and the blocks have wavy edges for a no-slip grip. A simple soap-and-water washing of the Stamp and Block will restore their "clingability." Approximate sizes of the blocks are smaller size: 2-1/4"x1-3/4" and larger size: 3-1/2"x2-1/2".