There are the gears with the 1:4 gearing ratio between opposite faces and the blue tiles. For the complete kit you need to order all seven of these sets:
● The Base Model. (1 set)
● The Blue Gears and Tiles. (1 set)
● The Red Gears and Tiles. (1 set)
● The Yellow Gears and Tiles. (1 set)
● The Green Gears and Tiles. (1 set) ← The model you are looking at now.
● The Orange and White/Black Tiles. (2 sets)