Durable resin construction. Features a sheep skull with 2 realistic horns. Perfect addition to your aquarium. Allows your fish to swim around. Dimensions: 7.25Lx 6W x 5.5H in. Add some metal style to any aquarium with the Penn Plax RAM Skull Aquarium Decor. This totally rad aquarium decoration is a sweet addition to any underwater setting. It offers fish a place to hide and is crafted of fish-safe, non-toxic resin that's great for saltwater or freshwater settings. 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.