Very good product
The gears are of average quality. The cross axles are of very poor quality. It is recommended that if one needs technic compatible parts one should go for the following 1. Good option: Beams, frames, and connectors 2. Good options: Expensive, rarely used gears or moving parts like differentials, turntables, knob gears 3. Average option: These should ideally be purchased from original manufacturer: main, drive-chain gears, heavy use gears, universal joint, etc 4. Avoidable: These should only be purchased from original manufacturer and copies can be avoided: Cross-beam axles, gears, moving parts, small-gears, etc The cross-axle beam and the small gears were of very poor quality. The frame and differential was acceptable. The setup makes noise while working, unlike the original.