Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5725-B-BLACK found under Lead Pencil Colored by Koh I Noor Rapidograph Inc. The National Stock Number assigned to this part is 7510013395548, 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 5725-B-BLACK.