So for the scx 10 iii im looking for new sliders as I don't like the look and all I can find are aluminum ones. They look good but since they're metal won't the catch on rocks compared to plastic ones sliding off the rock?
I say use 'em. I doubt you will have an issue other than them getting scratched up a bit. There are lots of steel sliders available but I personally wouldn't get aluminum if your terrain has sharp or rough rocks, aluminum tends to get sharp bits when it gets torn up.