Model Number:431331 Certification:NONE Features: Professional noise-blocking earplugs enable you to sleep comfortably, soundly and peacefully, improve sleep and life quality. Soft texture, wearing light if nothing. Small and soft, no swelling ears, selected memory sponge material, low density, less gap, noise reduction. The human cochlea structure is designed to fit the auricle and prevent falling off. PP material insulation outer cover blocks most of the noise, silica gel cover fits the ear canal to reduce low frequency noise, prevent the earplug from falling out. Can be washed repeatedly, healthy and hygienic. Specification: Material: Silicone + Slow Rebound Sponge Color:Black,Blue,Red Earplug cover color : Black,White,Grayrandom Size: 25mm*6mm Notes: When cleaning earplugs, please clean them with clean water and place them in a ventilated place to dry. Because the knitted product itself has a slight deviation in the shrinkage measurement,it is not a quality problem,please forgive me. Package include: 1 Box *Ear Plugs Packed Safely in Retail Box.