1/2 inch round preformed material swedged at each end to best fix ski contour. With 6 inch of 60 degrees turning carbide, this runner is designed for trail riders looking for performance in cornering power and control Pack of 2. Note: The use of aggressive skis, ski carbide runners or studs will alter the handling of your snowmobile, particularly in terms of maneuverability, acceleration and braking. Please refer to your operator's guide for more details.