This listing is for a set of two Micron 128MB RAM modules, with a total capacity of 256MB. These modules are compatible with MICRON/CRUCIAL brands and have a form factor of DIMM. The bus speed of these modules is PC-100 with a chipset/GPU model of CT16M64S4D8E.8T. These modules are perfect for upgrading your computer's memory and improving its performance. They are in good working condition and will be shipped securely. Thank you for considering this listing!