If you need a reusable cartridge to match your favorite 510 thread battery, you should check out this Wickless Metal and Glass Cartridge.

Made by The Kind Pen for connoisseurs, this cartridge has perfectly sized and spaced holes for thicker oils, but will also work well with your e-liquids. Combining a solid metal construction with a transparent glass jar, this cartridge is sturdy, reusable and easy to clean. 

The cartridge has a low resistance of 1.8 ohms and is sealed with a convenient cap that you can attach to your keychain or bag.