Underwater Treasures brings you this wonderful line of natural wood roots to compliment your custom aquatic environment. Each piece is completely unique! Underwater Treasures wood roots are safe for use in both freshwater and saltwater aquariums. Enhance the visual appeal of your aquarium with these exciting decorations! Medium - each piece is approximately 10" - 18". NOTE: Pieces vary in shape and size within the denoted range, and are chosen randomly at time of purchase.10" to 18"