Woodland ST1413 Subterrain 4% Incline/Decline Starter Set 4 Identical pieces that make 0" - 1.0" over 2' long x 2.5" Wide. The SubTerrain System's pre-cut inclines (with 2% (ST1412), 3% ( ST 1415) or 4% (ST1413) grade) remove the guesswork & complicated calculations.
