Black Shielding Tape for Electronics

So I've been looking around for this black shielding tape used for electronics (see picture below):

The mini PCIe slot to the right has black tape/film shielding the electronics underneath the mini PCIe card. Initially, I though it was a heat shield, but I think I've finally found the tape. mouser.com has a product called an EMI absorption sheet.

• Molex HOZOX EMI Absorption Sheet and Tape
• EMI absorption sheet and tape products

I'm still looking for a large sheet that can be cut to specification, but a least I'm closer to getting what I'm looking for.

I think the TDK Broadband RF/EMI Flexible Absorber Sheets are what I'm looking for.