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