A grommet is a round endless ring made from rope that is about five times as along as the circumference of the finished grommet. Read more about these interesting and useful knots on WikiHow or try this netplaces knot site article by Randy Penn. The traditional grommet is made from manila or other natural fiber rope. A length is "un-layed" then woven back together in a circular form.
whipping. Ropeworks offers a clear diagram for several types of whipping methods. These are made using "method 3" (scroll down to see it)
You can find grommet bracelets like these in WhatKnotShop on Etsy.
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