The Super Thick Magazine Top-Loader is made from 15 mil rigid plastic that is not only crystal clear but extremely durable and strong. It features a 10mm opening which will protect the thickest magazines. Top-Loaders are ideal for storage, transportation, handling, shows, stores, and POS protection. We have sold this product since 1985. No one has sold more Top-Loaders than Cardboard Gold! 5 per Package