Size Inside Wrist up to
Small 45 × 55 mm 6.5" / 16 cm
Medium 50 × 60 mm 7" / 17.5 cm
Large 60 × 67 mm 8" / 20 cm

Not sure which size? Wrap a soft tape measure (or a strip of paper) around your wrist. That measurement is your wrist size. Between two sizes? Go up. Most customers wear Medium. The bangle has a hinge and opens, so it doesn't need to fit over your hand.