This disposable, metal detectable earplug (Part #DPD1001) has an NRR of 31db. Corded earplugs provide a contoured fit. Earplug gently expands and self adjuststo all size ear canals. Packaged in convenient dispenser box with 100 pair per box. Pyramex Safety, www.pyramexsafety.com, (800) 736-8673. Circle 262