MarrywindixSODIAL(R) Pacifier Suspender Clips 1Inch - 25pcs

How can these be both "nickel plated" and "nickel free"?

Do they have a high shine/polished finish or they more matte looking.

Would these be strong enough to sew to a comforter and then clip to a duvet cover? Needing something to keep kiddos blankets in place.

Do these rust? I am thinkimg about using them to keep winter gloves together. Are they strong enough for that?