Incline/Decline Sets include the high-density foam pieces necessary to raise the elevation of your track from 0 to 4 inches, or lower the elevation of your track from 4 inches to 0 inches, allowing for a smooth transition from one height to another. Incline/Decline Sets come in either 2%, 3% or 4% grades. Sets are the ideal way to raise or lower the elevation of your track quickly and easily. To install Incline/Decline Sets, pin in place with Foam Nails and attach with Foam Tack Glue or the Low Temp Foam Glue Gun and Glue Sticks. ST1411 – 4% Incline/Decline Set – 4 sections raise/lower 4″ (10.1 cm) in an 8′ (2.43 m) run, each section measuring 2 1/2″ w x 24″ l (6.35 x 60.9 cm)