4 MB ROM Module
Apple 4MB ROM SIMM 341-0741. This ROM module is used in the Power Macintosh 6100, 7100, 8100 and Performa series. All of the modules in stock are from different manufacturers and look different, but all carry the same Apple part number.
There are a couple with number 341-0757 – leave a note at checkout if you want one of those.