Use Road Riser to establish an elevated road base and instantly set a flat surface for your roads and highways. Road Riser flexibility allows for modeling winding and hilly roads quickly and easily. Aligns easily with ¼-inch Modeling Sheet or set on top of 2" Support Panels. ¼" h x 2 ½" w x 24" l 4/pkg About Complete Terrain System The Terrain System includes all the products you need to model realistic terrain. These products all work together to make it easy to build any type of terrain for your layouts, displays and other projects. WARNING: CHOKING HAZARD - SMALL PARTS! NOT INTENDED FOR CHILDREN UNDER 3.