The Pencil Grip Pinch Grip, Ergonomic Writing Aid, Gloss Colored Pencil Grips, 6 Count - TPG-12706
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Questions & Answers
In the pack, 6 were found - In addition to the red and green, one light blue and one dark blue was also present. There are probably a lot of colors in there.
My opinion is that it is not true. I'd say they keep pretty tight tabs on each other. A regular type of pencil is designed to hold them steady.