Shungite is thought to emit protection against electromagnetic waves, including 5G frequencies. These handmade shungite phone stickers are a simple, inexpensive, and quick way to offer this type of protection from the devices that we use the most often, our cell phones. Just peel off the backing and stick directly on your cell phone or cell phone case! Stickers are 30 mm. The photo for size reference shows the 21 mm size which is slightly smaller than the size for this listing.