Versatile: Foam earplugs carry 38dB SNR, proficient at blocking out loud noises for hearing protection, stopping distractions while sleeping, and aiding concentration while studying. Multiple uses: Recommended applications: Studying, sleeping, shooting, flying, concerts, sporting events, fireworks, monster jam, woodworking, vacuuming, mowing, drilling and all noisy environments. Includes A Carrying Case: This set of noise reduction earplugs comes with a small aluminum case. You can attach it to a keychain or put it in your carry-on. Comfortable during use: These noise-canceling earplugs are made from CE and ANSI approved foam that does not will not cause pain, pressure or itching. Note: Data are all measured manually, please allow for an error of 1-3cm. Due to differences in light and display, there may be a certain color difference, which is subject to the actual object received.