What size fuse is this?

Is that it stamped on the lug by your thumb? I can't quite make it out (it looks vaguely like that might say 90A).

But as for size, I'd say that's a very large fuse.
 
They go by a few names in addition to mini-ANL. I've seen them called AFS and AFC as well. I replaced mine with proper littlefuse branded BF1 midi fusible links which were better made. There is a considerable size difference in the fusible link size. (100A BF1 is similar in size to the 40A cheap car audio part)
 
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