1. Ear piercers, studs and back plugs have been packaged together at the factory, and can be used after tearing off the wrapping paper.2. The built-in earrings are made of surgical grade steel, hypoallergenic, non-inflammatory, safe and hygienic3. This product is not a precision machine, and all parts are assembled by hand, and they will be automatically disassembled after finishing. If they are accidentally disassembled before use, they can be assembled again. It is not a quality problem. Please refer to the assembly method. Contact customer service to request.4. This product is a one-time product and cannot be reused. The reasons are as follows: Ear studs are in direct contact with blood and cannot be used again to avoid bacterial infection of the new ear piercing. Ear studs are prohibited from being used by others.5. You can hit it yourself, but because you cant see your ears, its inconvenient to aim when you hit it, and its easier to miss the shot. The shopkeeper suggested that you should try to find someone around you to help you operate to ensure a successful one.