Two Aluminum Dust Caps for your JBL Speakers.  They will replace your old 4 inch aluminum dust caps.  The actual diameter of these caps are 4 1/8.  The extra 1/8 inch allows this cap to cover your old glue residue from the cap that has been removed.  It can also be used on a new cone. Replace your old and dented caps to restore your speaker to like new condition.  The caps are correct for your JBL drivers.

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