Good size. Plastic construction. The negative aspect is that the case does not close/lock, so there is a risk of it opening.

The quality of its parts (plastic, fan, cable) is marginally satisfactory. Lower price compared to other well-known ones. However, it left me satisfied with its speed. Although it is larger in size, I use it instead of a USB stick. File transfer is much faster.

Purchased for €25. Installed a 256GB PM991 M.2 2242 Samsung, which was left over from upgrading my laptop's hard drive.
The box contained everything except the most important thing, the screw! You will find 2 USB-C to USB-C cables and a USB-A to USB-C cable, a screwdriver, a spacer, and 2 small thermal pads (and the screw if you are lucky). It opens and closes with a little pressure and sliding, no tool is needed, but you will need a screwdriver to remove the disk. Be careful because it is not shown in the instructions, we place the SSD in the slot and the copper spacer with the notch, we place it where we usually put the screw and we screw the screw from the bottom side of the board and tighten it until it is secure. See the photos.
The silicone pads help with temperature and ensure that the cover closes tightly.
The cables are about 0.5m long, but they are good enough, all the USB-C connectors have a "seam".
The blue LED, as usual, is blinding.
Speeds on USB-C 3.1 gen2 in benchmark: Read 850+ MB/s, Write 750+ MB/s. File transfer from SSD 980 Samsung to external SSD: 450-470 MB/s, and from external to SSD 980: 650-720 MB/s, which is great, I didn't expect much more with the 256GB I installed.
Recommended at the price I mentioned.