If you are measuring the wrist to get the correct size, please use the 'inner circumference' measurement.
If you are measuring one of your existing bracelets, please use the 'length' measurement.
internal circumference (including clasp): medium - 19cm large - 20.5cm
length (including clasp): medium - 20cm large - 22cm
clasp - width 0.8cm x length 3cm