These are SK Hynix 16GB DDR4 RDIMM server memory modules:
Part number: HMA82GR7AFR8N-VK
Capacity: 16GB each (2x = 32GB total kit)
Type: PC4-2666V-RE1-11 → DDR4-2666, Registered ECC (RDIMM), CL19
Config: 2Rx8 (dual rank, x8)
Voltage/rank code: VK = 1.2V, single-die
Use case: Server/workstation memory (needs a motherboard supporting registered ECC, e.g. Xeon/EPYC boards)