Generally, rubber bands are numbered from smallest to largest, width first. Thus, rubber bands numbered 8–19 are all 1⁄16 inch wide, with lengths going from 7⁄8 inch to 3 1⁄2 inches. Rubber band numbers 30–35 are for width of 1⁄8 inch, going again from shorter to longer. For even longer bands, the numbering starts over for numbers above 100, again starting at width 1⁄16 inch.
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