The BETAFPV 1404 motor is a perfect candidate for a lightweight 3S and 4S setup. It can be built with a regular carbon fiber frame to run 3-inch props on. This motor is great if you’re building 3-4” toothpick-style ultralight micro drones with 20A Toothpick F4 AIO FC.
1404 Motors retains φ1.5mm shaft design instead of thread shaft for saving weight, which means it needs M2 screws to lock props, while most of the 4inch props are locked with nuts in the market. These motors are best paired with 1.5mm shaft 4″ props- 4025 props.