The Atty 3 RDA cloned by Tobeco features a square sleeve, other than a round tube.
There are 2 big air vents on the sleeve for air flow.
Features:
1. 4-post design with dual positive posts
2. Pre-drilled post holes for easy coil building
3. Adjustable airflow control
4. Square sleeve
5. Wide bore delrin chuff enuff drip tip
6. Also comes with a 510 drip tip adaptor and a delrin 510 drip tip
7. 510 threading
Specs:
Post Quantity: 4
Airflow Control: Air holes
Depth of Deck: Regular
Contact Pin Material: Copper
Top Cap Design: Regular
Brand: Tobeco
Material: Stainless steel
Color: Stainless
Size: Height 42mm; Diameter 22mm
Threading: 510