The 3M No-Touch ear plug is made of polyurethane foam, is packaged 100 pair per box, comes in purple and meets CSA Class AL standards. Proper sizing is important when buying this item. The size for this products is Universal. An important part of this product is the amount of hearing protection it provides; referred to as the Noise Reduction Rating (NRR). This item has an NRR of 29 dB.