Want to design a new attachment for Build-A-Battle-Bot. These are the same motors used in the weapon system but with an array of different mounts & gear options.  Can be used for drive or other attachments. Ask about help finding different RPM (Gear Box Speeds) as these are a very common motor with 100's of different options.
 
100/5001000/1500/ RPM  @ 6V N20 Motors
Want faster. Check out this selection of high speed N20 motors. Caution Advised!