100% handmade: these artisan keycaps are made of resin. Specifications: OEM, Cherry Profiles, R4/Esc keycap (1u). The height differences between the OEM profiles and the CHERRY profiles are extremely small. These keycaps can therefore be used on both profiles. Fit to all Cherry MX Keyboards. Package Included: Keycap*1psc (keyboard not). Please note: Over the past years mechanical keyboards have become very popular and new brands have emerged. Although there is a standardised switch some brands can do the shaft slightly thinner or thicker making the key become a bit loose or tight. If your keycap is a bit loose the best way to adjust it is to add a tiny dot of glue on the inside of the cross, let it dry and that will increase the friction. Another way is adding a tiny thin piece of paper. If your keycap is a bit tight, using a hairdryer gently blow some hot air into the back of the keycap. Thank you for understanding. Please note that due to the nature of the resin, some air bubbles may form, but this is normal.