3M 1100子弹型耳塞 NRR: 29dB SNR: 31dB 子弹型轮廓设计、减噪效果好 表面经防污处理，佩戴卫生、 安全 1100 包装： 200付 / 盒，5盒 / 箱 = 1000付 货号: H0001876814 产品描述： 3M 1100 耳塞：产地：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.