When using Amazon you will need to have a UPC code. A UPC code is a bar code used for tracking your product.  These codes are created by a company called GS1.  You can buy them online.  One place to look would be barcodemania.com where you can buy in bulk or buy one at a time.

When selling on Amazon you will need a UPC code (Item Number) for every product you sell.  Each variation of that product will need a code.  So if you have several colors and sizes they will all need a separate code.

If you have any other questions on UPC codes please let us know.  You can email customerservice@teelaunch.com