Dual Purpose Earplugs. Removable Cord. Water and Noise. Reusable and Washable. Incredibly soft seal rings for extreme comfort. Seal out noise. 27 NRR for power tools, loud concerts, shooting, racing events, etc. Seal out water swim, shower, bathe, water sports. The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 For more information on noise reduction rating, tear along perforated line. Federal law prohibits removal of this label prior to purchase EPA. Label required by USEPA regulation 40 CFR Part 211 Subpart B. visit us online at macksearplugs.com package recyclable.