Helmet Earmuffs Black/Red, No Brand Easily clips onto helmets and fits most helmets. Euro slot system for easy attachment to compatible helmets. Noise Reduction: Designed with 2 layers of professional noise-absorbing foam and high-sealing solid cups, the earmuffs have excellent noise reduction, so you won't be bothered by noise. Function: An easy way to improve sleep quality, reduce noise damage to hearing, avoid noise interference, and effectively improve work and study efficiency. Material: ABS + Nylon + SS + Sponge NRR: 23dB SNR: 28dB Not specified Class 5 SLC (80): 29.5dB Item Size: 21 * 15cm / 8.27 * 5.91 inches Item Weight: 307g / 10.83oz Package Weight: 315g / 11.11oz Due to imported goods, there may be some scratches or stains due to the manufacturing process or during transportation. Please understand this in advance. "Please be sure to check the condition of the product with the images posted, and only purchase if you are satisfied."