Where T-Create Classic keeps to laptop-friendly SODIMM, Expert is TeamGroup's desktop-oriented tier of the same line, aimed at workstation-style builds where both capacity and clock speed matter rather than one at the expense of the other. This kit pairs two 32GB modules rather than the smaller sticks more common at mainstream capacities.
That's 64GB as 2×32GB of DDR5, rated 6400 MT/s CL34 — a tight CAS figure for a kit running this fast, though as always the rating only holds once XMP is enabled in the board's BIOS rather than left on JEDEC defaults.
It's UDIMM for standard desktop sockets, and running a large-capacity two-module kit like this one loads the memory controller less than filling all four slots with smaller sticks would.