- Recessed 510 connection
- Stainless steel top/lock ring
- Force fitted top cap (SS outside/brass inside)
- Copper contacts
- Positive contact is adjustable to compensate for slight variations in battery length
- Engraved logo
- Magnetic bottom firing switch with reverse-threaded locking ring
- Handcrafted clay for the Emma spinal cord
- Houses single 18350/18500/18650 batteries (batteries sold separately)