Battery Cap for Zero Nega 2. If you would like to change the SIZE of your whole Zero Nega 2, you have to pick up frame, tube and cap. Please note that 18650 and 18500 battery caps are different, so you might want to buy one if it's your first time changing your Zero Nega 2 size.
I have a Zero Nega 2 18650 size.
If I want to change the TUBE material/color: I pick up the 18650 tube
If I want to change the FRAME material/color: I pick up the 18650 frame
If I want to change the SIZE: I pick up 18500 FRAME + 18500 CAP + 18500 TUBE
You can easily change tube and frame to switch from 18500 to 18650 battery and back, or you can change the color and material of your tube or frame.