When the prop has the letter A on it, it spins to the left in order to push air to the back. Without the letter A, it is a B blade which needs to spin to the right to achieve the same. Most props support 0.8mm shaft.
You need to know that for the coreless motors, clockwise motors use red and blue wires while anti-clockwise motors use black and white wires. Prop size, on the other hand, depends on the coreless motor you use.
More tech info can be found here:
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