noise will do harm to your hearing and distract attention, this ear plugs are fitting and keep noise out to provide you a quiet world when you want sleep, work and study. Feature:PRESSURE RELIEVE: Flight ear plug, effectively regulate air pressure to reduce tinnitus for airplane flight or altitude change. OPTIMAL FIT: Silicone constructed, soft and non-toxic, no itching or pressure for long time wearing on construction sites, assemblies or operate noisy machines. PEACE QUIET: PU foam sleeping ear plug, dense spiracle to absorb noise, comfy for sleep without foreign body sensation.WIDELY USE: Can be used by people who are connected with the loud noise or people who would like to sleep in silence.PORTABLE: Organized in a box to keep them clean and convenient carrying. Specification: Material: Silicone PU Style: Flight earbud / Noise reduction earplug / Foam sleeping earplug (optional)Box size: 8.2 * 3.4 * 2.2cm / 3.2 * 1.3 * 0.8in Package weight: 60g / 2.1in Package List: 4 * Pair of Earplug 1 * Storage Box"