these are M Frame but there are many different types of M Frame and the price ranges between $100 and $400. for example: these sold on ebay for $300 and they look exactly like mine except for the frame color. Oakley 09-135 New M Frame Smoke Frame Black Iridium Hybrid S Lens Sunglasses | eBay there's also another pair that looks like mine but sold for $90.00. How do I know if mine are the more expensive version? THANKS!