1 mini vol and the 3 holds designed for it. Pictures show the designed configuration but they can be moved around. The 10mm crimp has a slopy side and a flat side and can be used either way up. When the undercut is placed so that the slopy side is flush with the top of the volume it will extend the surface of the front of the volume allowing a foot hold or another crimp to be placed there - make sure the screws for the extra hold go into the volume and not the undercut hold.
