HK-2000B SAFETY SILICONE EARPLUGS WITH CORD1.Standard, triple-flanged design provides an effective barrier to sound2.NRR 26Noise Reduction Rating3.Washable and reusable4. Packing: pp bag, paper case,plastic bottle,plastic box.5.Pefect for high noise level circumstance ,swimming,surfing, racing,shooting,travelling, bathing,sleeping and..