SnowTracker - EverlasterDo you have the feeling of sliding on icy pavements? Are your carbides round quickly and have no teeth left? Here is your solution, the EVERLASTER carbide BLADE Z carbides which will always remain sharp and until there are no more carbides inside. These are the only OEM replacement self sharpening healds on the market. Patented in Canada and the United States, these OEM replacement rails will give you maximum durability, optimal grip and longevity.