1. 5 different colors caps constructed by different material
2. 510 copper center with adjustable screw connection
3. Stealth finish with tiny and short shape design
4. Tri-post for bot single and dual coil building
5. Brass and stainless steel posts construction
6. adjustable airflow control with 2 air holes on sleeve
Derringer rebuildable dripping atomizer kit comes with 5 different caps with distinct colors. It is 510 threaded with adjustable copper center. There are 2 big air slits on the sleeve for adjustable airflow control.