Rain Forest Gravel selects only high quality all-natural stone from regions surrounding the Southwest Pacific. Use the gravel to control for water erosion, decoration around trees and flower beds, topcoat material for a ballast roof system, and/or reduce water usage with a dry scape lawn and garden. Margo's Rain Forest gravel helps stimulate a healthy natural environment for fish in aquariums, ponds and reduces the amount of unhealthy debris in the water. The gravel measures approximately 3/16 in. for versatile use in small residential projects to large commercial developments.