These black lotion pumps are compatible with all Bottiful Home 16 oz. and 3 oz. bottles. They twist open/closed and have no-contact springs that do not come in contact with the liquid. Each pump comes with a neck clip that must be removed prior pumping. Dip tubes are designed to fit the length of our 16 oz. bottles and can be cut down to accommodate any bottle shorter than 6″ from bottom to shoulder. Neck dimensions of these pumps are 24/410. Total of 4 pumps included.