This is a great Leather Case made by Jison Case. They make Premium Leather Folio Cases for a range of different devices. I highly suggest checking out their website as they have great options. This case uses magnets to lock and unlock your device whenever you open it. This case is also made out of premium leather so you can already guess that it will feel great it the hand.
Their Website: www.jisoncase.com
Fashion Flip Case: http://www.jisoncase.com/product/Fashion-Flip-Case-for-Galaxy-S4.html