What do the numbers 550 or 650 refer to in quadcopters?

I see some components such as ESCs say 'rated for 550/650 class quadcopters', but what is a 550 class? Size? Weight?

Thanks

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that is non sense ESC are rated for AMP draw as it relates to motor KV & Prop size . 550/650 craft AMP draw depends on motor and prop size !

250, 550, and 650 refer to the distance, in millimeters, between the vertical shafts of the farthest opposing motors on a multi-rotor SUAV, and thus size. Greater the distance usually corresponds to heavier machine requiring a higher amperage ESC.

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