Handcrafted: Because our keycaps are handcrafted, each keycap is virtually indistinguishable. Resin Material: The keycaps are made of premium resin, which is strong and durable for long term use, ensuring unlimited play. Comfortable Use: These keycaps offer top notch durability and a great typing feel that won't build up dirt easily. Note: When the keycap on the keyboard is installed, it is found that it is too tight or too loose, please do not force it. You can point a hair dryer at the socket portion of the keycap, heat it for about 5 seconds to soften the base slightly, and insert it into the shaft of the keyboard. Compatibility: Universal resin keyboard, suitable for most mechanical keyboards with for Cherry MX switches.