The thumper tips are basically stretched out crown killer tips. The purpose of this new design is to increase the sidewall for pushing as well as making the cap stay on better. Although the tip is designed for pushing, it is miraculous when used to knockdown crowns and pressure releasing dents.
Pro tip: Use a fresh cap when knocking down or blending after pushing with it.
Note: These caps fit super tight intentionally so as to avoid falling off down a floor or other area. They may need to be cut off.