nylon mesh for headphone 1) waterprrof and dustproof,ROHS 2) timely delivery, ... the electronic equipment are esposed to the water,air ,dust and some improper operation will breakdown them.such as ... such characteristics as friction-enduring, light-blocking, radiation-resistant, dust-proof, water-proof as well as static-electricity-absorbing .* ... .. 4) Details in picture diecut nylon mesh for headphone