Features: 1. Adjustable head circumference: Adjustable head circumference, suitable for most people's head circumference, easy to wear. 2. Material: High-density sponge material, soft and comfortable to wear. 3. Applicable scenes: suitable for use in an environment of 05 dB. Description: Rebound earmuff support, soft earmuffs, 360-degree rotatable shell, ABS drop-resistant shell. Specifications: Color: black, black red, black blue (optional) Material: ABS, sponge Head circumference: 15-24cm Noise reduction range: 26-35db Size: 14 * 18 * 9cm Package Included: 1 set of soundproof earmuffs Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2. Please allow slight dimension difference due to different manual measurement.