This is a complete set of four 17 simulators for 2011~Current GM/Chevy Dual wheel truck. The listing includes 2 Stainless Steel Front liners, 2 Stainless Steel Rear liners, 2 Chrome Plastic Front Center Caps, and 2 Chrome Plastic Rear Center Caps. Material: Stainless steel and Chrome Plastic; Works With: 17 wheels; Fits Make: Select Chevy and GM; Fits Models: Select 2 and 4 Wheel Drive Dually.