These genuine MAST rings are antibiotic susceptibility test rings, for convenient, simultaneous testing using 8 antibiotic discs. Each of the 8 discs is impregnated with a different antibiotic, and the complete ring will fit conveniently on top of a 90 mm diameter agar plate (petri dish). Each disc is printed with an identification letter, to avoid confusion. The use of a unique hydrophobic barrier on the paper ring device ensures that the antibiotic impregnated tips function as individual antibiotic susceptibility discs, generating precise circular zones of inhibition for measurement of the zone diameter.These MAST rings are made to our own specification and come with the following antibiotics:AP10 AMPICILLIN 10 ?g
C30 CHLORAMPHENICOL 30 ?g
E15 ERYTHROMYCIN 15 ?g
FOX30 CEFOXITIN 30 ?g
PG1 PENICILLIN 1unit
S10 STREPTOMYCIN 10 ?g
SF200 SULPHAFURAZOLE 200 ?g
T30 TETRACYCLINE 30 ?g Storage: Rings require refrigeration at 2 – 8 degrees C.