Micro G Threaded Oil Tank New microG tank by Grenco Science Concentrates only New threading design The microG tank is a replacement coil for the microG 2014 edition vaporizer. It is made with the new Grenco tank threading design. You can now easily thread just the heating coil directly to the battery for improved function. These microG Coils are compatible with the 2014 microG Vaporizer and the microG Herbal Kit. It is intended for use with concnetrates only. *Not intended for use with dry blends*Durability index of microG Herbal Tank is approximately 5-6 weeks.