This set contains the tracks, except for the jig and assembly pins which are part of set 2.
This set needs to be combined with Set 1
and Set 2 (option A or B)
to build a full tank. The trench skid in Set 4
is optional, as is the interior of Set 5 (option A, B or C)
The instructions can be downloaded here: https://www.shapeways.com/forum/index.php?t=msg&th=34511