This black, delrin drip tip can be used 3 different ways:

1. On an Atomizer, you can drip eLiquid right onto the heating element without even taking the cartridge off
2. On a Cartomizer, you can use the drip tip to extend the length of the Cartomizer by about 1/2".  This is especially useful with an eGo battery / Cartomizer combination, since Cartomizers are a bit shorter than an Atomizer/Cartridge combination, and the Atomizer cone on the eGo can make Cartomizers feel a bit short
3. If you're one of those vapers who like to hold your eCig with your teeth, the delrin of this Drip Tip is much more comfortable (and less likely to chip a tooth :) than the metal sides of either an Atomizer or Cartomizer.