It's such a simple thing. When a pencil becomes too short to hold comfortably, you don't want to have to hold it with a claw hand; you want something to make it longer so you can use it up completely. Colored pencils aren't cheap, so the more length you can use up before it can't…
Luminance 6901® Permanent Colored Pencils, Caran d'Ache
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Caran D'Ache : Pencil Lengthener : Red
Art-n-Fly Pencil Extenders Set of 5 Pencil Lengthener for Color Pencils : Office Products
Caran D'Ache : Pencil Lengthener : Red
Materials Guide
Art-n-Fly Pencil Extenders Set of 5 Pencil Lengthener for Color Pencils : Office Products