The product is a lot of 6 new 512MB DIMM modules from Sun Microsystems, specifically designed for the Sun Blade/Sun Fire 501-5030 models. These modules are ECC memory with a bus speed of PC-100. Each module has a capacity of 512MB, making the total capacity for the lot 3GB. The modules are registered and feature error correction capabilities, ensuring reliability and performance in computer systems. Ideal for those looking to upgrade or replace memory modules in their Sun Microsystems servers or workstations.