GAS Mods GR1 BF RDA is a unique cube-shaped rebuildable that will sit and look nicely with box mod devices. Designed for mouth to lung AND Direct to lung vaping style. Integrating an impressive highly advanced single coil version in 22mm diameter. GR1 RDA constructed with a highly intuitive airflow system - the airflow control accessories, which come with two different sizes of airholes. Along with bottom BF Pin and colorful caps are made of POM material. POM is characterized by its high strength, hardness and used in precision parts requiring high stiffness, low friction, and excellent dimensional stability.