These transition strips are designed to descend down from a Mainline height roadbed to 0 at the other end. These will work great when needing to transition down into a yard or a spur with no roadbed from the Main. You get two transitions with each item selected, 1-LH and 1-RH. Options include 30- or 45-degree slopes and Curvable or Non-Curvable. Curvable items are kerfed just over half-way on the thicker end.