LEGO Crazy Action Contraptions

Complete plans for making marvelous moving machines out of the special Lego that come with the book and some basic pieces you've already got at home.

This set comes with 2 85545 rubber belts in black. They are very slightly stiffer than the normal stretchy silicone feel 85545. Internal diameter is identical, belt diameter 2mm.
Known colour variations known include black 3736.