For use as a bracelet, in complement to the pendant, to grow into a geometry genius.
Inner diameter : 67 mm (Other sizes are available in my shop)
Check out my shop for more.
How to choose the right size? :
The small version has an inner diameter, of 57mm = 2.244 inches, usually fits children
The medium version has an inner diameter of 67 mm = 2.638 inches, usuallly fits women.
The large version has an inner diameter of 87 mm = 3.425 inches, usually fits men.
The method to determine for sure if the bracelet will be a fit or not is to draw a circle in some rigid cardboard (as the bracelet won't deform even in strong and flexible) of the tested diameter, then cut with scissors along this circle, and then try to fit the cardboard on your wrist.
Or if you already have some rigid circular bracelet that you know fit, you can compare the "inner" diameter.