The Howard Leight Pilot ear plug is made of polyurethane foam, is packaged 100 pair per box, 10 boxes per case and comes in blue. Proper sizing is important when buying this SKU. The size for this product is Universal. Some products are single use while others are reusable. This particular ear plugs is disposable. Ear plugs can come in many different shapes and colors. This ear plus is t-shape shaped.