You know that awesome magnetic car phone mount you have? Well, here are the metal plates that make it actually work! This pack comes with 2 rectangle plates and 2 round ones - the rectangles are about 40x65mm, and the rounds have a 40mm diameter. They're super thin at just 0.5mm, so they won't bulk up your phone. The adhesive on the back is seriously strong (just wait 24 hours after sticking for full strength). You can stick them right on your phone's back, slip them between your phone and case, or even attach them to your tablet or GPS. They're not magnets themselves - they're the metal plates that magnets stick to. Perfect replacement plates if you lost yours or need extras for multiple devices. No sharp edges, won't scratch your phone, and they work with most magnetic mounts out there. Pro tip: If your phone case is thicker than 1mm, stick the plate on the outside for best magnetic hold.