Size 21 Inside:13cm
Size 22 Inside:13.5cm
Size 23 Inside:14cm
Size 24 Inside:14.5cm
Size 25 Inside:15cm
Size 26 Inside:15.5cm
Size 27 Inside:16cm
Size 28 Inside:16.5cm
Size 29 Inside:17cm
Size 30 Inside:17.5cm
Size 31 Inside:18cm