Rubber Bands

A rubber band has three basic dimensions - length, width, and thickness. A rubber band's length is half its circumference. Its thickness is the distance from the inner circle to the outer circle. A rubber band is given a standard number based on its dimensions. Generally, rubber bands are numbered from smallest to largest, width first. Thus, rubber bands numbered 8-19 are all approximate 1.5mm wide, with length going from 22mm to 89mm. Rubber band numbers 30-34 are for width of 3mm, going again from shorter to longer. For even longer bands, the numbering starts over for numbers above 100, again starting at width 1.5mm. Source of information Wikipedia.

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