If you are looking for something practical and unique at the same time, Vandyvape Govad RTA would be a perfect choice for you.

WIth the transparent appearance, you may look at its whole function, design, and juice capability. The special design in 3D side airflow let the air flow more smoothly ,therefore ensure you the best flavor and dense vapor production. To give you more flexibility, it also comes with changeable capability function. Only if you remove 2ml block, it will switch to 4ml capability very easily. 

CREATIVE AND UNIQUE DESIGN.

Specifications: 
23.7mm Base Diameter
26mm Diameter at Widest Point
4ml Maximum Juice Capacity (Removal of Block)
2ml Standard Juice Capacity
Superior Stainless Steel Construction
Pyrex Glass Reinforcement
24K Gold-Plated Build Deck
Unique Clamp Style Two Post Design
Centrally Secured via Phillips-Screws
Spring Loaded Clamps for Easier Set Up
Dual External Adjustable Airflow
Three Directional Chamber Airflow
Dual Centralised Internal Air Tubes
Dual Slanted Internal Airslots
Juice Flow Control
Convenient Threaded Top-Fill Design
ULTEM Widebore Drip Tip
14mm Wide Delrin Widebore Drip Tip
510 Drip Tip Adapter
Gold-Plated 510 Connection