New Release! Simon Says: TRY Assorted Crystal Gemstones! Hero Arts is a leading manufacturer of wood mounted stamps and accessories. Ideal for embellishing rubber stamped greetings or scrapbook pages. The gemstones have adhesive already on them, you can use the full strip or one at a time. Directions for easy use are on the back of the sheet. There are 44 total pieces per package in 4 sizes! Each gemstone is round and measures 1 to 3mm.