Some sprockets have a little surface rust. I took a picture of one that has rust as an example. ALSO – the rubber rings may be a bit dirty and rough. This is totally normal, and they will work just fine.
41 Tooth Sprocket with Mount Hardware for 49cc 66/80cc Motorized Bicycle
41 tooth dished sprocket with 9 mounting holes. Unlike the cheap flat sprockets available, this dished sprocket is stronger and allows for better chain alignment.
Also includes mounting hardware, 2 rubber rings and 2 metal backer-plates.