HardyDisks* AST Ampicillin/Sulbactam SAM-20 5x50disk^ HardyDisks* AST Ampicillin/Sulbactam, SAM-20, impregnated paper disks used for Antimicrobial Susceptibility Testing (AST), also known as Kirby-Bauer testing, fully compatible with the BBL single or multiple disk dispensers, 5 x 50 disks