American Crafts-Crate Paper-Crate Paper-Gather Acrylic Stamps. Add fun designs to your paper crafting projects and more! Simply peel stamp from transparent sheet and apply to any acrylic block (sold separately) and stamp! This package contains five clear stamps on one 4x4 inch backing sheet. WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Do not mouth or chew. Imported.