Woodland Scenics ST1416 HO SubTerrain System Foam Incline Set 3% Pkg of 6Woodland Scenics ST1416 HO SubTerrain System Foam Incline Set 3% Pkg of 6 NIB 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 3% incline set is able to raise or lower the track 4 1 2" in a 12' run. Incline sets allow smooth transition from one