When Ty was racing the 449, this chain slider would always break and the chain would rub the frame. "The material was so thin, they wouldn't wear out, they were being ripped right off of there". So Ty designed some new chain sliders, but to his specification. These were never available to the public until now. They are black and made from much thicker material. *Also, be careful installing. They are made out of some really tough material that likes to snap back and pinch fingers.