Realistic Cave: This is a skeleton mountain that mimics the real world, and, as the painting shows, they will blend seamlessly with any environment, whether aquatic or arid. This cave is perfect for fighting fish, shrimp, small reptiles, salamanders, snakes and other small pets to live inside the cave. Excellent hiding place: The cave-style skeleton mountain with two holes running through the front and back has a unique shape that most small fish can pass through and swim and play in and around, which greatly helps reduce boredom and stress. At the same time the cave interior space is large, but also a great hiding place for reptiles and a variety of fish to hide. Size: The Rocky Mountain Cave measures about 5.1*5.1*5.3 inches (K*W*H) and the front and back holes measure about 1.4*2.5 inches. So it can easily fit into almost any home fish tank and reptile feeding box. No matter the size, it is the perfect choice. The decoration is designed with a flat bottom, so once you put it underwater, you won't have to worry about it floating around. Material Safety:The skeleton cave ornament is made of eco-friendly resin material, which is safe for both freshwater and saltwater aquariums. The material is non-toxic, non-polluting, non-damaging, non-staining, stable, non-fading, no special maintenance, easy to clean, and can be stored permanently. It does not affect the pH level in the tank and is very safe for both fish and reptiles. Risk-free shopping: we believe you will like our skull cave decorations, after receiving the package, please check whether the goods are intact, if there is any breakage or damage, please feel free to click the "Seller Contact" button in your Amazon account to send us an email. We will reply to you as soon as possible and give you a satisfactory answer.