The Wotofo Profile Unity RTA 810 Drip Tip is made of resin and can be used on any RDA or RTA that is compatible with 810 drip tips. It is nearly 2 times thicker than the one for the Profile RDA, but the center passage is smaller and has a gradual reduction in diameter downwards. The thickness is for consideration of heat dissipation and comfort, allowing the drip tip to snugly fit between your lips, while the center passage design facilitates flavor delivery. It's compatible with all the 810 tank setups. Wotofo sells the drip tip separately for all the vapers.