SIZE CHART 

Inter-Diameter(mm)

Inter-circumference(mm)

HK

US

13.8

/

5

/

14.1

44.2

6

3

14.3

45.5

7

/

14.7

46.8

8

/

14.9

47.4

9

4

15.3

49.3

10

/

15.7

50.6

11

5

16.1

51.9

12

/

16.5

52.5

13

6