Apple clearly mentioned in the introduction page that leather is a natural material. Like a high-quality leather belt, it may form lines, traces, or texture luster over time. < / P > < p > when used with MagSafe magnetic suction accessories, it will also leave fine marks (as shown in the figure below). If you have concerns about this, it is recommended that you use silica gel or transparent protective shell. The release and download schedule of Microsoft Flight Simulation varies from region to region