These are drip tips that have a knuckle joint letting you swivel your drip tip at an angle. Do you prefer dripping? This Drip Tip attaches to an atomizer replacing the cartridge. The center is hollow allowing you to drip liquid directly into the atomizer without taking off the drip tip. This item is reusable. Not recommended for use with auto switch batteries. For use with Joye 510, DSE901 or KR808D-1 Rinse in warm water before use.