"Frame size" refers to the physical dimensions or measurements of a frame or object, such as a picture frame, eyeglasses, or a bicycle frame. It helps determine the size or fit of something. Full definition
A fast camera recorded the resulting light at the rate of 400,000 frames per second over an image frame size of 64 pixels wide by 80 pixels high. (sciencedaily.com)
You can switch to the adult food when you feel your pet has reached their full body frame size. (californianaturalpet.com)
They do have different framing sizes, but it depends on the machines they have available at the time. (livingbiginatinyhouse.com)