The Apple says that the new iPhone 11 Pro has the toughest glass on a smartphone... but they didnt say anything about it acting like a chalk board. The new iPhone 11 has a subtle frosted textured glass, and in todays durability test we are going to see how that piece of glass handles different materials. Keys, coins, and razorblades are going to come in contact with the new iPhone 11 Pro Max.

Source: Youtube