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A set of test rings to find the right size. Marked with inner circumference in mm and US sizes. Shapeways´ mm lengths are slightly shorter, with polishing they are about standard in Strong and Flexible.
To make markings more clearly visible, you can either fill them with color, or color their surrounding, with a wide flat marker for example.
Includes every full and half size. If the ring that would be just right is missing, the correct size will be the quarter size between the slightly too big and slightly too small.