This listing is for a pair of Micron 128MB MT8LSDT1664AG-10EG1 PC100-222-620 RAM modules. These DIMMs are compatible with Micron/Crucial brands and feature a total capacity of 256MB, with each module having a capacity of 128MB. The bus speed is 100MHz with a CL2 latency. The chipset manufacturer is also Micron/Crucial, and the model number is CT16M64S4D8E.8T. These RAM modules are perfect for upgrading your computer's memory and improving its performance.