SUNMNS1 Inch Flat Key Chain Ring Metal Split Keychain Keyrings for Car Home Keys Organization, Arts Crafts, Lanyards, 36 Pieces

I'm looking for small key rings are these small or large for large amount of keys...I just need it for single key? Thank you

Does the color on the rings scratch or rub off easily?

Have these tarnished for anyone?

Can you buy just certain colors?