Warm Tips: 1. The noise reduction earmuffs may be a bit tight when you wear it for the first time, the tight seal can provide better noise reduction effect. 2. Made for reducing harmful noise to a safe level while allowing you to hear important sounds, not completely soundproof. 3. In the hot summer, please remove the noise protection earmuffs every 1-2 hours to get your ears relaxed. Specifications: Noise Reduction Rating: NRR28dB/SNR 34dB Muff Size: 3.9x3.1in/10x8 cm Earmuffs Weight: 10.9oz/308g Material: High-quality ABS Package Contents 1 x Mpow Noise Reduction Hearing Protector 1 x Carrying Bag