Slip tips, as the name suggests are designed to penetrate the fish and then disengage (slip off) and toggle. They have a dual purpose in that they aid in the prevention of bent spears and also increase the chances of landing bigger game fish. They also have their place in reef spearfishing but generally are reserved for larger pelagic fish.
RIFFE slip tips are specifically designed with a low profile and exceptional disengaging and toggling efficiency. They have stood the test of time and been proven over and over to be one of the best slip tips available.