This is the removable tank for the SXK Billet Box clone, commonly called the Boro, uses what are known as 'bridges'.
These are effectively small metal assemblies which allow for the use of different coils. The replacement Boro does not come with any bridges. This tank is available in black or white. The Boro has a potential capacity of around 5.5ml.
This tank is only compatible with the SXK Billet Box clone.