Upon inflation the ballonets protrude through the ring meshing to form occluded dimples the method permitting a large volume of gas in a smaller disc shaped area.

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Try to measure the area of a Frisbee disc with wooden blocks and the answer is pretty coarse, but do the same thing with 10 billion grains of sand and you can get pretty damn accurate.

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Wide print area of 24 mm inner diameter and 118 mm outer diameter for disc labeling.

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