It is made of aluminum and seems to be solidly made and has good heat dissipation properties.
The connector is USB Type-C, and Type-A to Type-C cable is included in addition to Type-C cable.
It's a complete package, including screws to hold the SSDs in place, a gel sheet to dissipate the heat, and even a tool (Phillips screwdriver).
Benchmark
Here are the benchmark results (by CrystalDiskMark) for USB 3.1 Gen 2 (10 Gbps) connection.
The contents of the case are Western Digital SN730 NVMe 256 GB.