Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4506 HIGGINS PEN CLEANER found under Pen Cleaner Liquid by Faber Castell Corp. The National Stock Number assigned to this part is 7510005582422, 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 4506 HIGGINS PEN CLEANER.