Lightweight ballast/gravel in 7 colors. Iron Ore, Dark Brown, Brown, Buff, Light Gray, Gray and Cinders. Three grades (fine, medium and coarse). For 32 oz., COVERAGE: N-Scale Approximately 6.4" to 21.2". HO-Scale Approximately 3.6" to 11.6" and O-Scale Approximately 2" to 6.4".