What are the basic components of the thermal transfer ribbon?

a) Thin and strong polyester or other high-density material tape base;
b) The base coat on the front side of the base to ensure uniform ink color and complete ink color transfer during printing;
c) Wax or resin based ink layer;
d) The outer coating on the ink layer protects the ink color and enhances the adhesion to the printed material during printing;
e) The back coating with the base prevents static electricity, heats up and reduces friction to protect the print head.

https://www.fivestar-label.com/product/ttr-ribbon-item/