Smok TF-RTA made of stainless steel and pyrex glass,with the super big deck-off-base design,deck G2 and G4 available,the tank can hold 4.5ml e-juice,hidden sealing ring and innovative juice flow control system,double layer drip tip,improved on the inner layer of glass to avoid scalding,
bottom with big airflow adjustable system,the same top refill design,easy filling e-juice.
http://www.vapingbest.com/smok-tfrta-rebuildable-tank-g4-g2-edition-p-503

The TF-RTA is different from other rebuildable tank atomizers on the market. The large 16mm diameter build deck offers a lot of space for builders and has made building more convenient. Two different build deck styles are available for the TF-RTA. The G4 decks allows users to efficiently build a quad coil setup and also comes pre built with a 0.14Ω quad coil build right out of the box. The G2 build deck utilizes the famous two post Velocity style build deck for easy building and comes pre built with a 0.45Ω dual coil build.

Specifications:

Dimensions: 65*24.5mm
Stainless Steel Construction
4.5mL Glass Tank
Large Build Deck
Build Deck Options:
TF-RTA G4 Deck (0.14Ω Pre Installed)
RF-RTA G2 Deck (0.45Ω Pre Installed)
Juice Flow Control
Swivel Top Cap Design For Top Fill
Double Layered Drip Tip
Four Cyclops Adjustable Airflow Holes