This is an SSD drive with a 960 GB storage capacity. This model has a PCIe form factor.
From Amazon
Transcend 960GB JetDrive 850 SSD (without Enclosure) for MacBook Air 11" and 13" (Mid 2013 – 2017), MacBook Pro Retina 13" and 15" (Late 2013 – Mid 2015) Up to 1600/1400 MB/s TS960GJDM850
This product is also available at 2 unverified stores.