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Moldex SparkPlugs earplugs are made of extra-soft, extra-light, and non-allergenic foam. Their non-irritating, tapered shape fits easily in the ear canal and seals gently and snugly without pressure. They're so comfortable, you'll forget you're wearing them! These disposable earplugs also offer a high NRR 33 noise reduction rating, making them suitable for most noisy environments. So while they look like fun, they still provide serious protection.