Copper-Hoppers!

Hello Mojang, I would like to give a suggestion of Copper Hoppers. Crafted the same way as regular hoppers, substituting the iron for copper, copper hoppers will transport items at different speeds depending on the oxidization-level of the hopper. The completely normal copper hopper would only be a bit slower than an iron hopper. Progressively, as they get more oxidized, they would transport their items slower. I hope that you all at mojang will at least view this idea, and I hope that it makes its way into the game, in some shape or form. Thank you for your time. Goodbye!