The North Decidamp ear plug is made of pvc foam, is packaged 200 pouches per dispenser box, 10 boxes per case, comes in white and meets ANSI S3.19-1974 - Attenuation Test Protocol (US), AS/NZS SLC80 23dB Class 4, EN 352-2, Z94.2-1994 - Attenuation Test Protocol (CAN) standards. Proper sizing is important when buying this product. 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 barrel shaped.