Make a statement with Skull Screws. Even though the threaded tips look as tough & rugged as heavy metal, they're made entirely of an ultra-soft foam to provide you with a stylish yet very comfortable hearing-protection option. Push-to-Fit design ensures the earplugs stay clean, even when your hands or gloves are dirty. Unique, nut-and-bolt-inspired stem grips allow you to insert & remove your earplugs without touching the foam plugs themselves. Ultra-soft, no-roll foam quickly adjusts to the shape of the ear canal to help create an excellent noise-reducing seal. Skull Screws are washable & reusable (handwash with soap & water only). Compatible with the 3M E-A-Rfit Dual-Ear Validation SystemE-A-Rfit provides an accurate quantitative assessment of exactly how much noise-reduction a hearing protector will provide to any given worker. Corded / Cordless: Corded; Shape: Threaded Bell; Material(s): Polyurethane Foam; Thermoplastic; Vinyl; Noise Reduction Rate (NRR): 32 dB.