CRAFTY SECRETS-Clear Art Stamps: Medium. These stamps cling to any acrylic stamping block (not included). The special features of these adorable heavily detailed stamps make them a must-have for any card maker, scrapbooker, as well as stamper. Features: High quality non-yellowing and long life photopolymer material, artistic detailed designs, versatile sets let you mix and match designs and sets and they are light weight for easy storage and transport. Stamps come mounted on 6x4in heavy weight plastic sheets for secure storage. Size and number of stamps vary by design. Made in USA.