One single Etymotic Research Attenuator for Musicians' Earplugs TM. Designed to allow you to hear the same sound quality, only quieter. Etymotic's Musicians Earplugs are created for use with custom fit molds, made from ear impressions by hearing professionals. These are such a great choice to allow you to protect your hearing without having to sacrifice quality of sound - with flat sound attenuation. The perfect solution for musicians and music enthusiasts.