Rubber Band Sizes
A rubber band has three basic dimensions: length, width, and thickness. (See picture.)
A rubber band's length is half its circumference. Its thickness is the distance from the inner circle to the outer circle.
If one imagines a rubber band in manufacture, that is, a long tube of rubber on a mandrel, before it is sliced into rubber bands, the band's width is how far apart the slices are cut.
[edit] Rubber Band Size Numbers
A rubber band is given a [quasi-]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 1/16 inch wide, with length going from 7/8 inch to 3 1/2 inches. Rubber band numbers 30-34 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.
The origin of these size numbers is not clear and there appears to be some conflict in the "standard" numbers. For example, one distributor[5] has a size 117 being 1/16 inch wide and a size 127 being 1/8 inch wide. However, an OfficeMax size 117[6] is 1/8 inch wide. A manufacturer[7] has a size 117A (1/16 inch wide) and a 117B (1/8 inch wide). Another distributor[8] calls them 7AA (1/16 inch wide) and 7A (1/8 inch wide) (but labels them as specialty bands).
| Rubber Band Sizes |
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