Brand new and high quality OOTDTY Feature: Easy installation, without any tool. Make sure to clean and dry the installation location. Compare with the installation location, find the best location to install. Tear off the sticker, use a dryer to warm up the adhesive tape before installation. A fixed position, on the one hand. Press the slow minutes firmly. Do not expose to sunlight or touch water for 48 hours. Car volume knob only, other demo accessories in the picture are not includedCompatible Model:Fit for Class B Class E GLK GLA CIA GLE GLSspecifications:Material: Aluminum Alloy Bottom Diameter: app.3.1cm/1.22in Top Hole Diameter: app.2.2cm/0.87in Thickness: app.1cm/0.39in Color: Silver, Blue, Red Quantity: 1 PcNote:Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before placing a bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank You Package Contents:1 x Car Volume Knob