Gram Positive Mast Rings - 100pkHigh quality genuine M13 MASTRING S supplied in a great value pack of 100. These gram positive multi test rings feature 8 antibiotic impregnated tips: Chloramphenicol 25g Erythromycin 5g Fusidic acid 10g Oxacillin 5g Novobiocin 5g Penicillin G 1 unit Streptomycin 10g Tetracycline 25g This allows the simultaneous application of the equivalent individual antimicrobial susceptibility test discs. Use in conjunction with our bacteria cultures to test the
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