Postcard Protective Sleeve Toploader - 3-7/8" x 6-3/8" - Pack of 25 Protective sleeve toploaders are essential items when collecting and saving postcards, or photos. Sold in packs of 25, these Guardhouse postcard toploaders are 12 mil thick and measure 6 3/8 x 3 7/8 inches. Guardhouse toploaders are made of non-plasticized rigid vinyl and are designed to keep photos and cards unharmed during long-term storage, at the same time as offering the collector great visibility of their collectible items.