E-A-Rflex 28 Semi-Aural Hearing Protectorn be worn in any of three positions (Over-the-Head, Under-the-Chin, Behind-the-Head). Comfortable, effective, light weight alternative to earmuffs. Easy insertion with no roll down. Highest level of protection available in a semi-insert hearing protector. Lightweight dielectric plastic construction. Non-irritating. Replaceable tips. Take-apart assembly for easy cleaning. Worn under-the-chin or behind-the-head, will not interfere with hard hat or glasses. Noise Reduction Rate (NRR): 28 dB; Packing Type: Poly Bag; Quantity: 10 per box; Type: Banded; Weight: 0.01 lb.