This is Clip Studio Paint Color Set of the Flexoki extended palette by Steph Ango.
Flexoki is copyright (c) 2023 Steph Ango.
https://stephango.com
https://github.com/kepano/flexoki
Distributed under the MIT License.
CSP color set conversion by Scott Andrew Lepera (2025).
https://scottandrew.com
From the Color Set palette menu, choose "Import color set" and choose the .CLS file.
You can also import a color set by dragging and dropping the file to the Color set palette.
https://help.clip-studio.com/en-us/manual_en/300_color/Color_Set_palette.htm