1. Silicone material, durable, non-toxic, no peculiar smell, no irritation to human body, no allergic reaction 2. Wearing soft and comfortable, with stronger sound insulation effect 3. S/M/L size can meet your various size requirements 4. Equipped with storage box, suitable for placing various in-ear earplugs to prevent loss and keep the earplugs tidy 5. Bluetooth headset is not included
