My child uses the "Yiyanshu" brand pen holder. The patent name seems to be called "Correct Writing Device". The fingers are directly held on the pen barrel, and the thumb is blocked by the front. I ran out and pressed it on my index finger to write. It was the same as holding a pen normally. It was very easy to use. After using it for a month, I basically got rid of the problem of writing with my wrist hooked.