You are looking at some 3d printed Tycho Starport Oil Drums. These will be printed in grey recycled PLA and will be ready for you to prime and paint and place on your layout.
You will receive 10 small oil drums and 4 pallet stacks with 6 fixed drums on each one. The barrels have great detail on which will really show up well when painted.
Dimensions are approx:
Single drums 2.1cm height
Drum stacks 5cm length 3.1cm width 2.1cm height
As shades of grey do change overtime, much like wall paint, you may receive buildings in different shades, roofs will always match the buildings though and most of the time we are sure these will be fully painted anyway. With all 3d prints there might be slight imperfections on the buildings just down to the printing process, however these can all be sanded down, painted over to make perfect using your own modelling skills