About Nylon|Generic nylon (polyamide). Usually refers to Nylon 6/6 or Nylon 6. See 6/6 for machining details. Good strength and wear resistance for gears, bushings, and structural plastic parts.
About Sheet|Thin flat stock, generally under 3/16", used for stamping, bending, shearing, and laser/plasma cutting. It's the starting material for enclosures, panels, brackets, and formed sheet metal parts.