How to Maintain Customized Keyboard

do not touch with your hands. If you touch it with your hand frequently, sweat and other substances will be left on the surface of the key shaped keychain, which is easy to cause oxidation. You should wear clean and soft cloth gloves or use tweezers to clip on the keys when you take them.

https://www.dhmedal.com/products/3d-football-keychains.html