Inner length:

21 yards long, 13.1cm 22 yards long, 13.6cm

23 yards long, 14.1cm 24 yards long, 14.6cm

25 yards long, 15.1cm 26 yards long, 15.8cm

27 yards long, 16.5cm 28 yards long, 17.2cm

29 yards long, 17.8cm 30 yards long, 18.4cm

31 yards long, 18.7cm 32 yards long, 19.4cm

33 yards long, 20 cm 34 yards long, 20.7cm

35 yards long, 21.3cm 36 yards long, 21.9cm