The subject of the auction are...
Brushless motor for drone types F450 / F500 or F550. Made of very durable components. The integrated hub and assembly screws are attached to the engine. CCW version - the opposite direction with clock directions!
Engine Topseed S2312 920kV is designed to drive multi-impeller models such as: F450 / F550 / X500 / X525 / S500 / S550.
Readytosky S2403,2300kV engine is designed to drive 250- class multi-impeller models 280 such as eg Robocat270, QUV250, QUV210.