Even for my grade 3 I bought this great Original Samsung Flip Wallet Case. And because I was so 100 percent happy with it, I have also ordered for the rating 4. Flip Wallet Case looks very valuable from, is super thin and fits perfectly. The grade 4 is inserted without rear wall in the Flipcase, thereby the whole thing very flat, but is still well protected. All cut-outs (for S Pen, camera, etc.) are present. Very pleasant is the automatic Sleep / Wake up function. Saves battery life because the display so consumes the most electricity. The card slot (card size) I find also very pleasant. And the price is, if you know the original price of Samsung, really very favorable. Absolute buy recommendation!
