If you're worried about cracking your poly-carbos, you need NOT to worry anymore because PHINIAC is the way to go! Their tanks are made of a thick grade of PYREX(YES, I said PYREX) tubing that can withstand the Banana and Cinnamon e-liquids! They also can do CUSTOM IMAGE DESIGNS depending on the SIZE and DETAILED work of the IMAGE! The CLEAR and COLORED tanks come in 3 different sizes: REGULAR, TALL BOY, and XL! ALL of which have different e-liquid capacities and cartomizer specs. for each size! The CLEAR tanks have 2 options for end caps: Delrin end caps with O-Rings, which come with the tank when purchased or Stainless Steel end caps with O-Rings, which can be purchased separately as an option! These FINE QUALITY tanks can last forever if you take care of them! These tanks are BEAUTIFULLY made and add a very STYLISH look to your mods! With DURABILITY and LONGEVITY, you won't be disappointed! Check them out at...phiniac.com