S: About 74cm 3 Ajustable Hole(Watch Board included), Suitable for wrist size 5.5-6.3 inch.
M: About 83cm3 Ajustable Hole(Watch Board included), Suitable for wrist size 6.3-7.2 inch.
L: About 96cm3 Ajustable Hole(Watch Board included), Suitable for wrist size 7.2-8.1 inch.
