No.7 E-Liquid can refill your cartridges for ANY E-Cigarette refillable model. Easily place 7-9 drops into your empty or blank cartridges to refill. We recommend using No.7 Micro blank cartridges, or No.7 Classic blank cartridges for optimal performance. 30ML will typically fill up to 60 CARTRIDGES in the MICRO starter kit cartridge sizes. We recommend this produce for 'advanced' users of E-Cigarettes. Please store in a cool place and avoid exposure to heat or direct sun light as it could change the consistency of the liquid.