There are many chastity belts out there, here are some of the more popular:
Here are some pics showing the models off:
The well-known cb3k.
The Curve, which is longer than the cb3000.
The cb2000, the smallest of the CB series.
The exo-belt, useful for use indoors and at night: no painful swellings!
Neosteel belt: one of the most secure belts available.
Neosteel with some devious extras...