Looks like a MoFi doesn't it? I tried a LOT of sleeves before finding this one. As a former MoFi dealer, I can confirm that these are identical. I snapped this pic of it side by side with the branded one for comparison.
Generic version of the same inner sleeve that everybody loves, but WITHOUT THE LOGO. They are a three-ply, anti-static, premium sleeve that is perfect for any 12" media. The construction consists of a rice paper layer sandwiched between two sheets of high-density polyethylene (HDPE) with a translucent HDPE front.