Apple’s iPhone 6 will launch in September in two sizes — 4.7 inches and 5.5 inches — the South China Morning Post reports. The cited sources are “industry insiders” who have reportedly seen the iPhone 6 prototypes. As some have speculated, the screens will allegedly be made entirely out of sapphire crystal. The new screens will be flat — not curved — and also will supposedly offer a pixel density of 441 pixels per inch, a jump from the current 326 ppi display, although it’s unclear which of the screen sizes would have that dot pitch. A prior report noted two new iPhones would feature displays larger than 4.5 inches and 5 inches.