3M 1100子彈型耳塞 NRR: 29dB SNR: 31dB 子彈型輪廓設計、減噪效果好 表面經防污處理，佩戴衛(wèi)生、 安全 1100 包裝： 200付 / 盒，5盒 / 箱 = 1000付 貨號: H0001876814 產品描述： 3M 1100 耳塞：產地：巴西 These are the stiffest of the poly-urethane foam plugs. For those who like the feel of UF, but want the stiffness of PVC （which makes insertion easier）, the 3M 1100 is a good choice.