I couldn't find them, so I decided to make them myself. My only coaster set (maybe will follow up with RGB?). The design story of these goes back to my own photo work with CMYK inkjet ink. Read the whole story here.
CYMK color set of 4 - a favorite for designers and photographers! Based on the colors in 4 color process, it includes Cyan, Magenta, Yellow, and Black (K)
Hand-cut heavy duty 4"x4", 3mm thick wool felt coasters
100% Merino wool felt - biodegradable, renewable, all natural
Hydrophilic! Absorbs up to 30% of its weight without feeling wet