The Arkray Combidisc GP1 is a 14-arm antibiotic disc designed to test the sensitivity of Gram-positive bacteria to different antibiotics in a single assay. It features a unique, patented architecture to prevent overlapping inhibition zones and offers a combination of common and newer generation antibiotics like Penicillin, Amoxicillin/clavulanic acid, Erythromycin, and Azithromycin. The GP1 disc helps determine which antibiotics are effective against a particular Gram-positive bacterial isolate, aiding in the diagnosis and treatment of infections.