The design of the sprockets would probably prohibit the use of many of the synthetic materials, especially on the "New style" snow trac sprockets. As Bob indicated they were designed to wear, rather than wearing out the grousers (cleats) and guides. The ones that the Canadian Phone company were having made, and the ones I used to make were made of a Brass alloy that contained a lubricating agent, graphite. There are some Bronze Bearing alloys that replaced "Babbit" that work much better than the original brass used by the Snow Trac manufacturer. Various Plastic and synthetic coverings do work well on the drive sprockets for most of the other makes of Cats, but they all have a metallic body underneath, usually aluminum.