These musicians ear plugs unique open-air membrane filter technology ensures natural sound and comfort while reducing harmful noise. This package Includes 2 comfort tip sizes and 1 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.Features patented filter technology to replicate the natural response of the ear canal so that sound is not muffled and music is heard clearly, but at a safer, reduced volume. Soft flanges enable maximum comfort, while a firm stem allows fast, easy insertion. Noise reduction rating (NRR) - 12 decibels Convenient detachable neck cord. Great for concerts, jam sessions, nightclubs, sporting events, shop work, etc.