Both are MicroSD adapters for MacBook Laptops that allow you to add more onboard storage. Both have solid aluminum endcaps to match your macbook and add a seamless, safe, onboard storage boost. Both sit flush.

Top MicroSD to SD Adapter Chip = TarDisk. Bottom MicroSD to SD Adapter Chip = Nifty.

The Nifty MiniDrive chip has a red glue substance. And a square shape cut up into bottom, this seats the chip in place in the plastic mold

TarDisk Chip on top in both images has a circular hole cut into the bottom right end the card sits in a shaped plastic bottom mold and is additionally secured in place by this hole and a small plastic peg in the mold.

Chips back side (verso) Top Chip TarDisk, bottom chip Nifty, both use gold for a faster connection. Read&Write speeds are about the same using the same chip and computer. TarDisk is slightly more responsive but is also newer. The Nifty Card for this test was also purchased new but was not built as recently.