Pierogi Maker by Cucina Pro - Includes Tray and Press - Makes 6 Dumplings, Potstickers, or Peirogis at a time

What is it made of?

Why do these turn all black and greasy and the chroming come off in the dish washer? I bought one and looking here at the one star reviews its a comm

what size do these make? 4" diameter?

how do I use the metal and plastic pieces?