24/25 inner length 13.5cm26/27 inner length 15.3cm28/29 inner length 16.6cm30/31 inner length 18cm32/33 inner length 19cm34/35 inner length 20cm36/37 fits sizes 35-3638/39 fits sizes 37-3840/41 fits sizes 39-4042/43 fits sizes 41-4244/45 fits sizes 43-4446/47 fits sizes 45-46