The product code is for color matching for straps used on the Barcelona Style Chairs and Footstool. This fee is $100 per color per order, regardless to how many straps you order. If you are ordering one of our replacement cushions sets, we will match to that leather. If you already have your cushions, and want us to provide the straps to match those, we can do that as well by sending us a sample of your existing belt or the leather from your cushions. For black, we will not need a sample for matching purposes.