Incline starters can be used alone or combined with Incline Sets (785-1410, 1411 & 1416, each sold separately) to start your track on an incline or continue down grade. Two Percent (#785-1412) Starters raise the track elevation 1/2′ Four Percent Starters raise tracks 1′. Each set includes eight identical pieces measuring 2-1/2′ wide x 24′ long.