Faber Castell Essentio (formerly Basic)

The Essentio range of fountain pens from Faber Castell (formerly called the BASIC) features a range of overlay barrel finishes in either Shiny or Matt metal, leather or Carbon Fibre with a soft-touch cap and gripping section or an aluminium barrel and grip section. These models take standard size cartridges or they can be adapted to use bottled ink using a Faber Castell converter (use only this converter as other brands may be too wide for the barrel). The Essentio has a stainless steel nib  and weighs between 27g and 44g depending upon finish with an overall length of 140mm when closed.
Note that in the images above the pen shown closed is actually a rollerball model so there may be small detail differences.