The product is a set of 6 cent National Parks Centennial 10 blocks of 4 stamps issued between 1961-1970 in the United States. These stamps feature a multi-color design related to parks and are mint never hinged. Each block contains 4 stamps, making a total of 10 blocks for a total denomination of 60 cents. These stamps are ungraded and uncertified, providing collectors with a unique and historical addition to their stamp collection.