S:About 13cm(Watch Board not included), Suitable for wrist size 16.5cm(6.5 inch).
M:About 14cm(Watch Board not included), Suitable for wrist size 18cm(7 inch).
L: About 15cm(Watch Board not included), Suitable for wrist size 19cm(7.5 inch).
XL:About 16.5cm(Watch Board not included), Suitable for wrist size 20.5cm(8 inch).
