Jack Richeson JACK-499987 Quiller Color Wheel for All Media by Stephen Quiller, 8,5 x 21,6 cm

I waited about a month to get my Quiller Wheel (it took forever). When I first saw it, I was extremely happy with it. But as I started to look at the different shades of green, I noticed there were some weird black stains on many of them making it difficult to see the color. Some other colors have those stains on them too but the greens are the worst. I'm very disappointed.

Vert helpful tool for an artist. I wish the wheel was bigger. The names of the colours can be hard to read because the letters are so small. The colours blobs should also have been a bit bigger.

Actually useful reference

色環だけより、色んな代表的な色が載っていて参考になります。加えて、裏の説明も、平易な英語で、単なる色並べでない色使いにまで、言及してあって興味深いです。まあるいパレットが頭に浮かぶようです。素晴らしい！

The chart is a handy reference but way too pricey for what it is. With a bit of research, you can easily make your own. Not good value. Also, understandably, does not include all available colors, so some DIY may be required regardless.