3M Lawn and Garden Disposable Earplugs, used to help protect ears against noises at or exceeding 85 decibels such as lawn mowers and trimmers are made of a smooth, soft foam formulation expand slowly to fit in most ear canals comfortably. 3M Lawn and Garden Disposable Earplugs feature a Noise Reduction Rating (NRR) of 32 decibels.