Essentials is Mushkin's no-frills line — from a long-running boutique memory maker better known among enthusiasts for its higher-end kits — a plain aluminum-heatspreader part here with none of the branding or lighting of its flashier siblings.
The whole family shares one 3200 MT/s CL22 rating, so the only thing that changes between listings is how 64GB is split — this one is 2×32GB. Mushkin sells several similarly named lines across its catalog, so it's worth checking the exact model rather than assuming any 'Essentials'-branded kit is interchangeable.
It's DDR4 UDIMM, non-ECC, for standard desktop boards, and — as with any DDR4 kit — the rated 3200 MT/s only shows up once XMP is enabled in BIOS rather than left at JEDEC defaults.