Letter writers, envelope artist and greetings queens will love our complete set of postally-inspired stamps. From useful to fun, fancy to functional, there is bound to be a bunch of postal stamps you need to use on every package, letter or card you send. Stamp sizes range from 0.75" x 0.75" to 0.875"x 1.75" 15 different designs in the set About our stamps: Our clear stamps are made from yellowing-resistant photopolymers. Photopolymer is latex-free. These stamps, if stored properly, should last a lifetime and privde clear, crisp images time and time again. Photopolymer stamps should be used with clear acrylic blocks to make placement and clean-up quick and easy. Should your stamp lose stickiness, wash it with warm soap and water or clear stamp cleaner.