LB and FT, I suspect you guys are using your wire wrong. Don't use it as an extension to your chain. Wrap a doubled strand of 16ga through the ring on your trap chain, and around your pole, limb, or whatever you are fastening to. Twist both ends together, so it brings the ring tight against the pole. No slack, and no flex point on the wire. If you leave a flex point, by using wire as an extension, I would expect breakage. Wiring solid like I described, should hold any marten you catch. It's worked for me on thousands of them, with no problems, anyway. I just use cheap 16 gauge rebar tie wire.