Qty. 1 2 3 4 5 6 7 8 9 10 Add to Cart SMOK TFV8 X-Baby Replacement Glass Tube 4ml 3pc - is currently on backorder. You may still purchase now though and we'll ship as soon as more become available. 3 pack of 4 ml replacement glass tube for the Smok TFV8 X-Baby Top Tank.