The O.Pen Vape Refillable Cartridge has a capacity of 0.5 ml. and is expressly designed to be used in your O.PenVape. Each one has a life-expectancy of 6 months from first use and you can fill it with any herbal oil that you wish to vaporize. If you are looking to mix your own oils then we recommend that you check out the O.PenVape Kit which is available with all the essentials necessary for the task including an O.PenVape.
We would stress that the cartridge is intended to be used with essential plant oils and extracts exclusively in jurisdictions where it is legal to consume such materials.
PLEASE NOTE: All sales on used cartridges are final and returns are NOT accepted for legal reasons.