Car Mount Metal Plate -Egrace Replacement Metal Plate kits For All Magnetic Mount Air Vent Cradle Cellphone Holder X4 Pack 2 Rectangle and 2 Round (Black) Special Industrial electrophoresis treatment,the metal is anti-rust,anti scratch Ultral slim fit design,about 0.3mm thickness,you can put it between your phone and phone case,it is really invisable. Competiable with all brand magnetic car mount cellphone holder,it has no harm to your cellphone singnel. Each plate has strong 3M adhesive stick,just rip it off and stick to any device you would like to use cooperative with the magnetic mount 60 Days money back guaranteed,36 months factory comfortable warranty