It consists of a 5/8" x 10" threaded rod, and two each of lobed end-caps, 1 3/4" cubes, and 3 3/4", 3 3/8", and 2 1/4" wheels. One of the cubes has just over 1/2 of a decal type III (dt3) remaining.
Note: assembled incorrectly in auction photos, as the two smallest wheels should be at the outside. Uploaded photo shows it correctly.