Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NDC00781-7167-83 found under Estradiol Transdermal System by Sandoz Inc. The National Stock Number assigned to this part is 6505016600483, 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 NDC00781-7167-83.