Pink Cat Studio Background UNMOUNTED Stamp Set #3. This set includes 6 stamps which make great backgrounds for ATCs and greeting cards. This is a very fun set for making whisical backgrounds! This is an unmounted sheet of grey rubber only. There is no cushion attached and measures 7.5" x 4". Try our Tsukineko Tack ’n Peel Sheet. It is a reusable product designed for creating a stamping block when using unmounted stamps. When you're ready to re-use it, it restores its tackiness by just wiping the surface with a wet cloth or rinse with water. Check out their site to see all of the wonderful cards that were made by using their stamp sets.