The product is a lot of 21 A-Tech 8GB DDR4-2400 PC4-19200 288-Pin DIMM non-ECC RAM modules. These memory modules are designed for high performance and reliability, with a total capacity of 8GB per module and a lifetime manufacturer warranty. Ideal for upgrading or replacing existing RAM modules in computers, these DDR4 SDRAM modules offer fast bus speeds and are compatible with systems that require a 288-pin DIMM form factor. The non-ECC feature ensures error correction and stable data processing, making these modules a solid choice for enhancing system performance.