SKYsmoke SLIM empty Tanks, 5 pcs in pack. One filled tank 0,9 ml. will last for a whole day. For Filling it is required to purchase an e-liquid! The tanks are reusable! One tank can be refilled with e-liquid max. 60 times. Suitable for following products: SKYsmoke SLIM, SKYsmoke SMALL, SKYsmoke LEA Business Class.