These are Corsair Vengeance LPX DDR4 RAM sticks, designed with a black low-profile heat spreader for improved heat dissipation. [1, 2]
The model shown appears to be a 32GB kit (2x16GB) operating at a speed of 3200MHz, suitable for high-performance computing.
This memory is optimized for high-performance overclocking and is compatible with modern desktop motherboards.