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Product Informatio Name: iMeBoBo Multi-Layer Noise Earplug Material: Nano silica gel material+ Memory sponge Size: 17mm* 14mm Colors: Black Gray Yellow and Red Include: Nano silica gel + slow rebound sponge + shark fin tail filter Package: Colors box and stroage box Feature 1.Human cochlea structure design, fits the auricle to prevent shedding 2.Nano silica gel + slow rebound earplugs, 2 different noise reduction methods 3. Filter+ soft elastomer + sponge earplugs, triple noise reduction. Sound insulation effect increased by 60% 4.It can be washed repeatedly and used repeatedly, which is healthy and hygienic. Environmentally friendly and durable