This is a case of 1,000 postcard holders in packs of 25. They are rigid vinyl , 16 mil PVC with 40 Mil opening. These rigid sleeves will protect your postcards, enhance their appearance and preserve their value. Size is 5.75 x 3.625 - they open on the long end and perfectly fit the classic standard size postcards made from 1898-1970's. Shipping is free.