Pyramex- Disposable corded earplugs are embedded with an iron ball in the plug and metal shavings in the cord- NRR 31dB - Disposable corded earplugs are embedded with an iron ball in the plug and metal shavings in the cord.- Eye-catching color, metal and magnetic detectable used for food manufacturing. - Soft foam earplugs gently expand and self adjust to all size ear canals.