The core is grey cotton with a round "boulder button" made of polymer clay. The string is a lightweight twisted cotton tapestry woven onto the core strands.
All materials are hand dyed in a water based system, more about this process here and also here.
The rounded button slips easily through the loops but stays put when engaged.
Polymer clay is a great material for simple elements like buttons. It's easy to handle and quick to make up new buttons if you run out unexpectedly.
A few other projects you might like:
one button string weave leather lacing cuff white
heather grey one button cuff (similar colors)
collection of string weave bracelets
More of these are available for you to purchase in the ETSY shop in the tapestry cuffs section
design and photographs copyright 2017