Compare

Airflow	Dual Airflow	Dual Airflow	Single Airflow	Single Airflow
Pressure Level	Higher Pressure - Adjustable Lung pull	Lower Pressure - Adjustable Mouth pull	Higher Pressure - Fixed lung pull	Lower Pressure - FIxed mouth pull
Pressure System	In the Bite Cap	In the Bite Cap	In the Base	In the Base
Flavor System	Flavor Pack 3 flavors - change wick	Flavor Pack 3 flavors - change wick	ZERO Cap Pack Mint - change cap	E-Z Cap Pack Lavender - change cap
Fidget System	Cap + Crown both rotational	Cap + Crown both rotational	-	-
Bite Cap Bonus	Silicone Bite Relief - Washable too!	Silicone Bite Relief - Washable too!	-	-
How Long Does it Last	Reusable for years	Reusable for years	Reusable for years	Reusable for years
Weight	75g	75g	16g	16g
Material	Aluminium + Silicone	Aluminium + Silicone	Plastic	Plastic
Size	Height 10.7cm Diameter 2.7cm Width - Depth -	Height 10.7cm Diameter 2.7cm Width - Depth -	Height 10 cm Diameter 2.5 cm Width 2.1 cm Depth 0.9cm	Height 10 cm Diameter 2.5 cm Width 2.1 cm Depth 0.9 cm