The Smok Bulb Glass Tank #7, made of high-quality Pyrex glass material, with bubble style, can hold 5ml juice. only compatible with TFV8 Baby V2 Tanks. This replacement glass tube with bubble-style allows it can hole more e juice, vapers can use it to replace the old glass tank on your Smok TFV8 baby tanks, easy install and use, no leaking worry. it’s a more durable and longer lifespan.