They have wide and thin blades in their size category which makes them much flexible in crash conditions where they do not break easily. 1045 sf propellers black especially draws larger currents and in results will give you a considerable amount of thrust. This 1045 propeller can be used with brushless motors with an 800 2200 kv rating. With a low kv motor 800 1400 kv, this propeller offers smooth flights with longer flight times perfect for fpv and aerial photography.