Flat design is becoming more popular day by day. Most Web and graphic element are being designed in flat design due to its popularity. Flat designs looks very simple and great in appearance. So here are some high quality useful fat designs UI kits for free. These kits include basic web and graphic design element like buttons, navigation menus, music players, icons, progress bars, price tables and many more. Lets have a look at the collection below and use the best UI kit to design an amazing design. Please share to other if you like. Thanks in Advance !!!