15 Years Tiny Hardware / Gears Manufacturer1.You should assemble it yourself.2.Need some qualifications to collect them! be carefull. if you dont have it, don't suggest to purchase it!!!Package A: 1 Set WITHOUT MotorPackage B: 1 Set with TWO 46RPM MotorPackage C: 1 Set with TWO 240RPM MotorPackage D: 1 Set with TWO 1200RPM MotorPackage E: 1 Set with TWO 6400RPM MotorThe assembly issue is especially to fix the bearing, Option one: glue (preferably now not too stable fluidity), Option two: soldering tin (high requirements), Option three: take the entire bearing as a sleeve, the middle of the bearing glued or weld is also OK, Option Four: use the 3-d revealed disguise like the picture, If you would like the stl of 3D, go away us message or electronic mail address, then we can put one in your transport for free. Alos you need to use the model to develop the shell/fixing seat/screw hole, etc., and print it yourself. Option five:we will Consider generating some copper sleeves to interchange bearings, otherwise you have your personal stainless steel/brass sleeves to use, and so on. Motor fixing with glue or different means.