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The 3M E-A-R Classic Soft Earplugs are made of a proprietary thermal-reactive foam that starts out firm for easy fitting in the ears, but then softens from body heat for a comfortable fit that customizes to the unique shape of each ear. Bright yellow color allows supervisors to conduct a quick visual hearing protection compliance check. Each pair of earplugs come in a poly bag to keep them clean prior to use. Recommended applications include chipping, chiseling, drilling, furnace operations, grinding, heavy equipment operations, machining, pouring/casting, power fastening, riveting, sanding, sawing and welding. These earplugs are commonly used in the following industries: agriculture, automotive, chemicals, construction, general manufacturing, healthcare, oil and gas, and pharmaceuticals.