Ideal models from ETS DIDACTIC GMBH for explaining the assembly, dismantling and functioning of gear units and bearings. The models have adapted fits, allowing assembly and disassembly without press-in or injection tools and lubricants. The corrosion-resistant components are supplied in sturdy storage systems, all the tools and auxiliary equipment required for the work are integrated. Detailed instructions describe the correct assembly and dismantling in illustrated work steps to the trainee.