Inner length:

21 yards long, 13.2cm 22 yards long, 13.7cm

23 yards long, 14.2cm 24 yards long, 14.7cm

25 yards long, 15.2cm 26 yards long, 15.5cm

27 yards long, 16.1cm 28 yards long, 16.7cm

29 yards long, 17.3cm 30 yards long, 17.9cm

31 inside long 18.4cm 32 yards long, 19.1cm

33 inside long 19.7cm 34 inside long 20.4cm

35 yards long, 21.1cm 36 inside long 21.8cm