This item is made of stainless steel.
The cage and ring are locked together with the lock. Once the lock is locked there really is no escape (unless you have the key).
Tube Length: 65mm(Long Side).
Tube Diameter: 29mm.
The PA lock diameters: 6mm / 4mm (for your choice).
100% Brand New.
Comfort, Hypoallergenic and durable.
It is very secure, designed by human body tectonics
Easy to use and clean.