Bilsom® 555/556 Earplugs Four incredibly soft and supple flanges adjust perfectly to the ear canal to create a soothing, noise suppressing experience for the most sensitive ears. A revolutionary two step molding process provides a stable stem and super soft flanges for easy, proper insertion. Superb attenuation properties (NRR 27), yet speech and warning signals may still be heard. Colorful for quick, easy compliance checks. Corded 556 is designed with a break-away cord for added safety around heavy machinery. 100% recyclable.