Posted on this page are all sizes of slip collars.  I will Keep them together, metallic and non metallic, due to there are not many metallic.   You may choose to upgrade any slip collar into snap slip, martingale over the heads and martingale quick release.  That will be $1 extra for each collar.

 
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Slip Collars
Slip Collars Metallic - non-metallic
Slip Collars
Slip Collars Mixed lengths