TOOPRE Rubber Hammer Practical Multifunction Rubber Hammer Non-Slip Handle MTB Bike Bottom Bracket Mounting Removal Tools

The reviewer mentions the TOOPRE rubber mallet twice in the context of using it to help remove a stubborn crank. They state it can be useful to give a crank a good whack to break the taper and get it started, and they demonstrate using it for this purpose. They also note that their own mallet has a split in the rubber from having done this many times before.