Add some rugged coolness to any aquarium with the Penn Plax Crocodile Skull Aquarium Decor. This skull offers a spooky touch to any underwater setting while also offering a spot for fish to hide. It's crafted of fish-safe, non-toxic resin that's great for saltwater or freshwater aquariums. About Penn Plax: Penn-Plax is a family-owned company in operation since 1959. They specialize in creating excellent pet supplies for animals both great and small. Best known for producing pet products at affordable prices, the Penn-Plax brand is synonymous with innovation and quality, keeping your pet foremost in mind. Durable resin construction. Features a gator skull with sharp teeth. Offers a perfect place for your fish to hide and play. Adds a spooky touch to any aquarium. Dimensions: 9L x 4W x 5.5H in..