Uses the concave side design of Stud Boy's original Shaper Bars with a new dual-runner design. One-piece design for light weight. Turns like a performance runner. Makes its own groove, so no darting on the trails. Eliminates dual-runner drag so no top-end loss. Self-cleaning design won't clog with snow, ice or rocks. Won't snag on obstacles. Extremely durable. Some models require drilling extra holes in skis..
