The pinkyhold slides over the end of the bow to provide somewhere for finger 4 (pinky finger) to sit. It really helps pinky finger to stay curved. It also helps the bow hand to stay in place and not slide up the bow. The pinky hold is made of black rubber.
The cylidrical foam slides over the stick of the bow to provide a wider and more comfy place for the hand to sit.
I’ll send instructions on how to get them onto your bow.