What grade is this case? (B4)

1401227-3a-336-10x-1024x1024 1401227-3a-336-10x2-1024x1024 1401227-3a-336-20x-1024x1024 1401227-3a-336-20x2-1024x1024 1401227-3a-336-20x3-1024x1024 1401227-3a-336-20x4-1024x1024