I ordered these adaptive pen grips after seeing a Tumblr post about them and they finally arrived today. I have been trying different pen grips for my tablet pen (which is like only 1mm thicker than a wood pencil, but that's enough to make itincompatible with other grips).
Can use them on practically any width drawing tool/paint brush
Stays put (it has these neat little tabs on the ends that you can tuck under to hold it in place)
Easily removable (so I can store my tablet pen)
Doesn't affect the button on my tablet pen
Grippy silicone is easier to hold than foam
Clear silicone is going to get dirty quickly (cloudy look after handling for a few minutes)
Doesn't add a lot of thickness (increases 8mm to 14mm width on a standard wood pencil)
More expensive than other grips
Overall, I'm happy to make this work, both for my tablet pen and the skinny paint brushes I use at work. I have a history of hand/wrist issues, and I really shouldn't be using pencils without a grip. These are the only size-adjustable grips I have seen (other than the one I made myself). I'm especially impressed by the way it holds itself on, but I think tucking those tabs might be difficult for someone with low dexterity (I have dexterity issues myself but after a few attempts I got it.)
But I would love this exact same product at twice the thickness and a bit longer. For now, I'll be layering them.
These soft spiral pencil grips from Kutusuwa can fit on virtually any size pen or pencil!