GradCap Metal Plate for Magnetic Phone Mount - 4 Packs Universal Ultra Thin Black Metal Disc w/Strong 3M Adhesive Sticker - Replacement Accessory Kit - 2 Rectangle (1.75"x2.5") & 2 Round (1.5"x1.5")Parameters: STRONg ADHESION] gradcap Magnetic Phone Sticker is using 3M double-sided grade quality sticker and that is why it provides strong adhesive o..