GMK CYL Prussian Alert

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by GMK


Hello good lads, this is my first keycap IC.
This set was inspired by a keyboard friend of mine whose favorite shade of blue is Prussian Blue. He was looking forward to GMK Prussian Blue GB, but it got indefinitely postponed. To troll him, I started designing something with the same blue and a simple idea came to my mind – what about an *insert color here* Alert set? At the same time, I wanted to do something a little different and I didn’t like how it looked with the often-used beige as a base, so instead I ultimately chose to use white and grey.

Link on Geekhack

IC form


GMK CYL Prussian Alert uses three RAL Design colors:
RAL 230 20 20 – Prussian Blue
RAL 000 65 00 – Mortar Grey
RAL 000 85 00 – Shadow White

Base Kit Explained

Why is there a forced Alert Bar in the Base Kit?
With the set not being beige, I removed the R1 Mono Bar completely and went straight with the Alert one in the Base Kit (See KKB Violet Alert as an example which has both in the Base Kit but lacks Numpad and Alice support).
This saves cost and should allow the Numpad, Alice, and R5 support to be in the Base Kit while hopefully maintaining a competitive price. Also, most of the people buying an Alert set want the Alert Bar and not having to buy a separate Alert Kit means less cost to them.

Why no 40’s support in the Base Kit?
With the set being Alert, it doesn’t cater to 40% users so I decided not to include 40’s support in the Base Kit. If you want to put this set on a 40% keyboard there is the option to buy the Extension Kit, where I included the basic 4-Key 40’s support. I chose to make the 1.5U Enter key in Prussian Blue as the main color to make the classic Esc/Enter Accent combo.


  • Material: ABS material
  • Profile: Cherry profile
  • Production Method: Double-shot (UV Printed Sublegends for Alpha Kit)
  • Manufacturer: GMK
  • Friendly Reminder: Only base keycaps included, no keyboard
  • Compatibility: Cherry MX switches and MX-style clones
  • Keycaps set designer: Gtour  


  • To be undated