This is a 4 TB WD Black SN850X NVME SSD (4th Gen PCIe) with heatsink.

Note: The heatsink is fully removable if your motherboard has one built in, you just remove the 5 T3 screws on the side.

I am selling it because I just don't need it, it works great. You can see a full health report in the pictures. A printed copy will also be included.

Reads: 49558 GB Writes: 29297 GB Power on Count: 1183 Power On Hours: 2286 Health: 100%