... a cap for your hammer.
I know, that this is basically a small box. I did need a little bit more soft hammer and designed this cap quickly. The only advantage is, that the interesting parameter for a hammer cap are adjustable, otherwise maybe every other customizable box design do it as well.
Unfortunately it was slightly to small for my main hammer face, but luckily it fits to the other side and I could use it.
The design is customizable for your hammer face ... or box.