Infinikey Blacklight is a set of keycaps that is available to pre-order through a Group Buy.
Keycaps: The caps you put on your keyboard. Buying a set of keycaps does not include a keyboard. You need a mechanical keyboard with MX-style switches to put these on, which you'll have to buy separately.
Group Buy (GB): a pre-order for these keycaps. This set will be manufactured after the GB period. If you join this GB, you'll receive the set after production is completed.
Still have questions? Check out Keyboard University, which covers keyboard basics to learn more 🎓