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This convenient set of antibiotic sensitivity discs contains two paper discs of four different antibiotics (8 discs total): Penicillin 10 units, Ampicillin 10 mcg, Neomycin 30 mcg, and Erythromycin 10 mcg. Each antibiotic sensitivity disc is 1/4" diameter. These antibiotic discs are used for bacteria sensitivity testing and allow you to test up to two different bacteria cultures with four different antibiotics.