Fumo Shisha Stones are a non-tobacco alternative for those who wish to participate in Shisha smoking without the effects of nicotine. The volcanic stones hold the glycerine flavoring to dispense a flavorful vapor. The stones are reusable, so don’t throw them away! After the stones cool simply put them back in the bottle and shake to refill the stones with flavoring. Additional flavoring can be purchase separately to replenish the stone once they are depleted.