Solid 1 piece construction. Flat bottom makes it stand steadily in your aquarium. Make sure use the sandpaper to smoothen the edges and soak the decoration for at least 24 hours in the sink. The vibrant resin coral mountain cave ornament is great for nano beta fish and guppies. Makes the tank look a lot more colorful and adds much fun for the fish. Size: 4.7'' L x 6'' H. Medium size recommended for 5-20 gallon fish tanks or large fish bowls. Great for aquarium decorations, model making, terrarium, miniature garden and marine aquariums. With 4 cave entry/exit holes for fish to enjoy. Each hole is about 1.5 to 2 inches which is a fabulous size for small fish to swim through. Made of durable resin material and vibrant colors are vivid and not washed out. Perfect piece to add to saltwater or freshwater tank.