The Elite name covers a fairly wide span of DDR5 speed grades from TeamGroup, and 6400 MT/s sits toward the faster end of that spread. A comparatively high CAS figure such as CL52 on a bin this fast is common — the two numbers trade off against each other, and Elite kits are generally sold on reaching a given headline speed at whatever latency accompanies it rather than the tightest possible timings.
This configuration is 32GB as 2×16GB of DDR5. As with any XMP kit, the 6400 MT/s rating only applies once that profile is enabled in BIOS — without it, expect a considerably lower default speed.
Physically it's UDIMM, built for standard desktop boards and sold as a matched pair for dual-channel operation.