The weight is 27kg, which is very heavy for such a model and gives a lot of stability.
The tracks are nicely detailed dut definitely not C45 grade steel. Probably aluminium or zinc/aluminium alloy. Only the rollers and idler wheels are machined from steel.
As the discussion of the comparison with a 70 ton class machine was opened in this topic, here are some more pictures with the model side by side with my EC700B for size comparison.
