Spring steel and PET headband,wear comfortable,soft foam-filled cushions with a good seal; Spring steel and PET headband,wear comfortable,soft foam-filled cushions with a good seal;NRR:18dB;Adjustable headband;Weight:140g;Packing:1 set/bag,Application:50sets/ctn,59cm*39cm*39cm,8kg/7kg;Machinery,construction,mining,steel,transportation,automotive and other industries. Earmuff