Stainless steel is the hardest and most durable of any of the metals used for collars.
If you have a dog that has any type of allergic reaction to metals then you need a stainless collar.

The Micro Mini type of prong collar is designed for small dogs with a neck size of 9 inches fitting snug. It can easily be made smaller or larger by removing or adding links.

The collar should be placed up on the top end of a dogs neck just behind the ears. It should fit snuggly so it does not slip down to the base of the neck.

Additional links can be purchased seperatly.