Owevvin20 Pcs Washable Plastic Paint Tray Palettes,Watercolor Oil Palette Board, White Art Plastic Palettes for Artists Painters Kids, DIY Art Painting Palettes

Q: How large are the round wells? Approximate diameter of the circles would help me tremendously. Thanks in advance!

The large wells are 1" in diameter

Q: Is configuration comfortable for left-handed painters?

Well, being right handed, I hadn't really thought about it, but I had an used one close, so I stuck my right thumb into the hole and except that the wells and mixing areas were opposite in position from before. I could still paint easily although it did feel odd to me. Well worth the price and they clean up easily except for some paints that are harder to remove. I do number them so I can use similar paint colors or mixes.