These are made of polycarbonate tubing, which is slightly flexible, so these fit snug when going over your hand, but they will fit beautifully on your wrist; gently roll them over your hand to get them on.
Sizing:
Small: 5.6cm/2.2" Diameter, 6.91" Inner CircumferenceMedium: 6cm/2.36" Diameter, 7.41" Inner CircumferenceLarge: 6.5cm/2.56" Diameter, 8.04" Inner CircumferenceExtra Large: 7cm/2.75" Diameter, 8.64" Inner Circumference