Ballast holds railroad ties in place and also works great for modeling gravel roads. Available in several colors and sizes you can mix and match for the ultimate realistic effect. Ballast is lightweight and easy to use. This is a Woodland Scenics patented product. Comes in a reusable clear plastic bottle with screw-on shaker lid. Two flip-top sections on the lid allow you to shake or spoon the amount of material needed. Blends well with the Woodland Scenics turf field grass and other foliage products. Comes in a reusable clear plastic bottle with screw-on shaker lid. Two flip-top sections on the lid allow you to shake or spoon the amount of material needed. Each shaker contains approximately enough material to cover a 2 foot x 2 foot space 1/64 high requiring about 6 shakers to cover a standard 4 foot by 6 foot gaming space.