Gina K. Designs - Acrylic Block - Comfort Blocks - Extra Large Rectangle - 5.25″ X 4″. Comfort Blocks by Gina K. Designs are softly curved, lighter weight acrylic blocks. They are comfortable to hold in your hands with no sharp edges. The extra lightweight acrylic with laser-etched gridlines allow for easy positioning and the sizes are perfect for both greetings and image style stamps. Clean with mild soap and water or Gina K. Designs Stamp Cleaner. These blocks have been manufactured to our specifications and are the perfect complement to your stamp positioning tool.