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Designed and sold in agreement with rainkeebs.mx
Yasui is a pro micro based 4×10 ortholinear keyboard. PCB supports MX switches and an RGB strip. Numerous bottom row options are supported allowing for a layout that works for anyone. V2 (this one!) also has official VIA firmware and support, as well as VIAL firmware. VIAL hex can be found here.
Included in this kit is a PCB, switch plate, bottom plate, mounting hardware, bumpons, reset switch, and diodes. To complete this you will need a pro micro controller (or compatible replacement) and any applicable stabs for your chosen layout.
Firmware can be found in QMK master. Yasui supports VIA as well~
You will need to compile your own firmware, more details can be found in the QMK docs.