A+ 17 Inch Stainless Steel Dually Wheel Simulator Set for 2011 Current GM/Chevy 3500HD The 2 front and 2 rear wheel liners are made of high quality stainless steel 304 for lasting beauty 4 center caps are chrome plastic. The simulator or liner are stainless steel and held on 2 of the lugnuts on each wheel. Easy install and removal. Makes your wheels shiny again at an affordable cost.