what is the module of these gears?

I don't know. It is not printed on the gears anywhere and I cant honestly see well enough right now to count the teeth. their pretty small. so I don't know.

The promotional codes 5fmsmqp8 and 9l4wnv7 didn't work as i tried them, and none made any differences at all! why? will you fix the issues?

I feel this question is either for Amazon or the supplier, I don’t think I could help.

do you have suggested things you could make w/ these for 7 year old ?

My 7 year old and I made a car using posicle sticks and a glue gun in addition to the kit. Since the gears are so small the tollerance for placing them correctly is pretty tight. My 7 year old wasn't able to line up the axle holes by himself and still have the gears mesh. With adult help and immagination you could make all kinds of contraptions.

Item Weight	2.4 ounces
Item Dimensions	5.7 x 3.5 x 1 inches
Size	Small
Material Type	Plastic, Rubber
Color	Assorted
Subject Character	Robot
Theme	Car,Robot
Battery Type	No batteries required
Operation Mode	Manual
Educational Objective	Color Recognition
Power Source	Manual
Number of Players	1

Toy Plastic Gears

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