The SLP runners are the only runners that will fit and function properly on Tri-Keel I and Tri-Keel II Skis. Trail Carbides, Tri-Keel I and Tri-Keel II: 6 x 75° carbide runners designed for general to aggressive trail riding. These runners are interchangeable with all Tri-Keel skis regardless of snowmobile brand. SLP carbide runners are of the highest quality and provide proper fit and performance. Hardweld surfaced in front of carbide to extend runner life.