In humid environments, standard steel grills can quickly become compromised, leaving the speaker system vulnerable, not to mention any aesthetic considerations. The MTC-25WMG-1 is a high humidity replacement grill for JBL Control 25 Series. The MTC-25WMG-1 grill is made of a rustproof powder coated aluminum alloy to provide greater protection and extend the service life of your JBL speakers. Color: black.