These are replacement baffles for the JCA amp heads, in perforated metal. It comes stock on 100HDM and is retrofittable on 50H, 100H, and Amelia. It's a simple replacement which can be done at home with a phillips screwdriver.
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JCA50H Metal Baffle
Super easy to install. You do have to remove the amp from the case, or at least it was much easier for me to do so, but we're talking less than 12 screws total. Took maybe 10 minutes to install. I do wish it came with screws and nuts to install the original Jetcity Badge to the new baffle. But it still looks like a beast without the badge.