Noise cancelling and swimming silicone ear plugs 1.NRR:25dB 2.Washable nontoxic silicone material with rope 3.CE/ANSI Noise cancelling and swimming silicone ear plugs 1.Features: Smooth ... ,noise reducing.2.Usage: Travel,swimming,sleeping,outdoor sports,car racing,living,airport,airplane,army,suited for everybody to noise reducing.3 ...