I got a new set of Camoplast Tatou 4s tracks for my Yamaha Grizzley about a month ago, I got them for hunting lions in the snow, did alot of research and decided $4000 for them was cheaper than buying a new snowmobile. These things are absolutely amazing!!! They will go places that I never thought was possible, even for a snowmobile, they are not very fast but plenty fast enough for what I am using them for, going to my hounds when they tree. Best money that I have spent in awhile.