These two are my top choices for collars i would love to earn. I would wear either one in public, and the collar i would wear in private is completely up to my master.
Click image for larger version.  Name: ptn-wire1.jpg  Views: 40  Size: 26.8 KB  ID: 20383

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The website i got these from were

http://www.bondagecollars.com/mainpage.htm