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Cheaply constructed. The wires are loose and are only good for about one use. Of the 18 (3 pkg) I purchased, only 11 actually worked. This was after an hour of re-wiring the motors to the battery holders (purchased separately) and securing with electrical tape. Even then, they didn’t work all the time abs kept shorting out. It was a severe disappointment to my students who were trying to construct simple robots.