785-1411 - 2' 4% Incline set 4/Incline Set SubTerrain System 4% Grade 4 24" 61cm Section Flexible inclines are designed to simplify adding changes in elevation along straight or curved tracks. The pre cut foam sections are molded in 2, 3 or 4 percent grades, which takes the guesswork and complex math out of building different levels of track. The 2% Sections (#785 1410) raise the track 4" in 16'. The 3% Sections (#785 1415) elevate tracks 4 1 2" in 12'. Four Percent sections