please  leave massage which size you want  or we  will send random

19 inner circle diameter is 19 mm, inner circumference of 59.66 mm

Inner circle diameter is 20 mm, inner circumference of 62.8 mm

21 inner circle diameter is 21 mm, inner circumference of 65.94 mm

22 inner circle diameter is 22 mm, inner circumference of 69.08 mm