As a professional artist I love this perfect circle tool (see my attached work). It's large enough to create large circles for use in large artworks. It is durable and will hold any regular sized pencil. The needle holding the tool in one place is very sharp and can poke a hole in your painting, so you need to put something between the painting and the needle to prevent this. I used a thin eraser. Have fun creating perfect circles if you have OCD like me! 🤣
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