More convenient & easier to use than disposable foam earplugs, Tri-Flange Earplugs feature a flexible, thermoplastic ear tip with a three-flange design to ensure both an excellent ear-canal seal & a comfortable fit. Contoured livewire stems allow you to insert & remove your earplugs without touching the tips, so the tips & your ears remain clean, even if your hands or gloves aren't. Pre-molded earplug tip & stem 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: Round Tri-Flange; Material(s): Acrylonitrile Butadiene Styrene (ABS); Cloth; Elastomeric Polymer; Noise Reduction Rate (NRR): 26 dB.