21 yards, 13.5cm long

22 yards inside length 14.0cm

23 yards within 14.5cm long

24 yards inside length 15.0cm

25 yards within the length of 15.5cm

26 yards inside length 16.0cm

27 yards within 16.5cm long

28 yards within the length of 17.2cm

29 yards inside length 17.8cm

30 yards 18.3cm long

31 yards/inner length 19cm

32 yards/inner length 19.5cm

33 yards/inner length 20cm

34 yards/inner length 20.8cm

35 yards/inner length 21.5cm

36 yards/inner length 22cm

21-25 please take 5 pairs

26-30 please take 5 pairs

31-36 please take 6 pairs