These are simple, durable, affordable wedding bands.  At least the silver one should have a very long life.  I don't know what gives the gold and black ones their color, or how long it will take for that color to wear off and show the stainless steel underneath.  At least when they are new, no one can tell these aren't white and yellow gold.

The only part I don't like about these is that the material is twice as thick as it needs to be, making it dig into the adjacent fingers a bit when I close my hand.