This package of four 4% Incline Starters raise elevations of your track one inch in 24" /SILENT". Incline Starters allow smooth transition from one height to another. To install Inclines, center on the Risers, butt the sections tightly, pin in place with Foam Nails (ST1432) and attach. The Low Temp Foam Glue Gun (ST1445 and Glue Sticks ST1446) are the fastest way to assemble your layout, but you can also use Foam Tack Glue (ST1444).