The product is made of brass. I have not had the product long enought to determine the durability of the finish.
You can use any 1-1/2" FLANGED Tailpiece. Can be brass or plastic, length you will have to determine.
We do. Part number D2089-10 Please see link http://www.westbrass.com/store/pc/In-Sink-Erator-Disposal-Flange-and-Stopper-638p4607.htm
No. The Strainer & Basket are metal.