Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NDC00193-2741-21 found under Test Strips And Col by Bayer Corp. The National Stock Number assigned to this part is 6550012106852, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NDC00193-2741-21.