Purple Onion Designs stamps are UNMOUNTED RED RUBBER. The stamps will require some type of adhesive or cling to stick to your acrylic block. There are many products that can be used for this including cling stamps which you will find in the purple onion and tool section of the store. Purple Onion Designs stamps are copyrighted by each individual artist and can not be used on items being sold at resale. THESE IMAGES ARE FOR PERSONAL USE ONLY and are not covered by an angel policy.