It is a 3d printable model. There are 8 gears, and it is a sphere (ball). The diameter is appr. 34 mm. Ignore the obj and fbx format files, they are just used to meet cgtrader's requirement. We suggest using resin material when printing. ABS/PLA may not be good enough to print accurate parts. You can download the free 3D PDF file here: https://www.tanerxun.com/simple-bevel-gear-examples/.html