ACOUFUN FIDELITY ER-20L PLUGS. Fidelity ER20 ACOUFUN Black Edition is the reference in high-end reusable filter hearing protection for music lovers. It offers unrivaled listening quality thanks to its -20 dB linear attenuation. Washable and reusable, equipped with comfort and absolute discretion - Standard size - Use: concerts, music shows, discos, festivals, music rehearsals. - Attenuation: SNR 20dB. - Contents: 1 pair of protections, 1 necklace and 1 metal tube. - Maintenance: washable with soapy water - Adults