This product is either discontinued or we cannot get that from suppliers.
G.SKILL F4-4000C18D-16GTZR, Capacity 16GB (8GBx2), Dual Channel Kit, Speed 4000MH, 1.35v, Unbuffered, Non-ECC, Non-Fan. A completely exposed light bar with vibrant RGB LEDs, merged with the award-winning Trident Z heatspreader designed, and constructed with the highest quality components, the Trident Z RGB DDR4 memory kit combines.