This page has some great info about bitless bridles, the traditional kind. Another info page.

Keep in mind you'll hear/see a lot of negative things about mech hacks. That's b/c they are leverage bits that can exert an enormous amount of pressure on the horse's nose, not something that belongs in rough or uneducated hands or on a green horse's head.

Lately I've been riding my (very broke) mare in a mechanical hack, and it's really cool b/c I can have such light communication with her, but I would never use it on a horse who didn't understand the basics of neck reining.

...............CherryHorse Blog..................