Features: 1. The silicone material is durable, soft and fits your ears, wears for a long time without swelling 2. Non-toxic, harmless, no peculiar smell, no irritation to the human body, no allergic reaction 3. Suitable for 5-7mm diameter earphone plug 4. Three sizes of ear caps can be replaced at will according to your own needs 5. Equipped with storage box, easy to carry and store