Part number CN672B-50-ND is Discontinued , https://www.digikey.com/en/products/detail/cnc-tech/3135-16-1-0500-001-1-TS/9450363?s=N4IgTCBcDaIMIDkBsB2MAhAtAVgAyYQBEQBdAXyA , we do have this available in the DigiSpool part number 1175-3135-16-1-0500-001-1-TS-DS-ND , https://www.digikey.com/en/products/detail/cnc-tech/3135-16-1-0500-001-1-TS/9450093?s=N4IgTCBcDaIIxwOwFYC0BmO61wGyrlQAZkijijDCAVAZVQBF6A5BgAhAF0BfIA , the customer just needs to order the number of feet they want . as this is on a 500 foot spool from the manufacturer . These are the same part from CNCTech .
Data sheet , https://www.cnctech.us/pdfs/3135-XX-1-0500-0XX-1-TS_.pdf
Manufacturer web site https://www.cnctech.us/productdetails.asp?ID=22277