These musician's ear plugs unique open-air membrane filter technology ensures natural sound and comfort while reducing harmful noise. This package Includes two comfort tip sizes and one set of filters. They have a super-low profile design for inconspicuous wear while soft flanges ensure maximum comfort. With a noise reduction rating (NRR) of 12 decibels, they're great for musicians, concerts, jam sessions, nightclubs, sporting events, shop work, etc. An aluminum keychain carrying case included.