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This is a gearbox for a 7mm Pager Motor, it uses a Ball Bearing for Maximum effiecency. I recomend using this gearbox with a GWS 4025 Prop.
Here are the items you will need to complete it:
Shaft - http://www.shapeways.com/model/edit/373670/
Gearbox Body - http://www.shapeways.com/model/edit/373669/
Spur Gear - http://www.shapeways.com/model/edit/373668/
Pinion Gear - http://www.shapeways.com/model/edit/373654/
Ball Bearing - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9234
7mm Pager Motor - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=12021 ( you only need one so you will have one spare)
This is the propeller i recomend to use with it - http://www.hobbyking.com/hobbyking/store/__10040__GWS_EP_Propeller_DD_4025_102x64mm_6pcs_set_.html
You will also need some threadlock or superglue to gold the pinion on the motor shaft