Comtim 2 Pack Dog Tag Clips, Stainless Steel Heavy Duty Quick Clips Pet ID Tag Holder for Dog/Cat Collar and Harness

Do these tarnish? I purchased a different brand and after three weeks, they’ve tarnished and turned our white dog’s chest black.

I have a 65lb Staffordshire. She is very muscular, strong and fast. Will this be sturdy enough for her?

How long is this clip?

How big are these