BA-13 Material:titanium such as 4mm bar

such as 4mm bar

but the length after making must be added 7mm

while the metal cage does not need be as thick as resin cage

5mm-15mmTo figure out which sound/dilator is best for you

For other sizes

BA-13 Material:titanium such as 4mm baraterial: Stainless Steel TitaniumThe below 3 sizes is must needed: 1. Chastity Cage Overall Length(over 45mm,the cage shape would be curved)2. Penis Tube Inner Diameter 3. Base Ring Inner Diameter The original lock mechanism is permanent lock,once insert the permanent lock gear to the gap,the penis tube can't be removed from the base ring,the chastity cage will be 1 piece completely,makes it become permanent chastity cage. There is no way to escape