Amp Gremlin covers take only seconds to install and remove, and they serve double-duty for showing band logos, sponsorships, advertising, or as part of your stage's overall look and design. You can place any image, logo or slogan on the grill of an amp, bass cabinet, or PA speaker quickly and then just as easily, remove it later. This is a good plan when using rented gear or if other bands use your band members' amps too. They are made of a unique mesh material that is transparent to sound coming from the amp's speakers and so does not significantly change sound quality. The stretch fabric used by Amp Gremlin allows for an easy grip on the amp's handles and, where appropriate, a cut out section for access to input and outputs connections is made available.