Pro-File Custom ski runners are universal fit to flat bottom skis such as steel leaf spring ski shown. They can also be fit to IFS plastic skis that are flat [NOT ARCHED] on bottom of keel. Runners have 6” carbide brazed in and include steel strips to extend front of runner as needed to fit the ski. Customer must supply studs & nuts then fit and weld components as needed. Sold per set of two. These are not TR type runners.