Bumper and Min + Max

[EricH]

That looks like the right image. So the "Not OK" flags are for no bumper where there should be one and a bumper that is too short (and on a frame section that is too short to support a full 8"+ bumper).

[FrankJ]

Not a bumper also means that it is part of the robot for the purposes of weight, costing, bag & tag rules, and so on.