4 years & up. Combine literacy with arts using these wonderful Letters and Punctuation Stamps Set for Sentence Building and Crafts. Choose either the Uppercase or Lowercase set, or both. Each set contains 26 letters with eight punctuation marks. The stamps are made of durable plastic and rubber. These stamp letters are great for introducing the alphabet, art projects, early literacy practice, creativity, and basic sentence and word building. Encourage children to go over the alphabet as they stamp. Includes a sectioned plastic storage case. Stamps measure 1" square.