Add some natural, rustic beauty to any aquarium with the Penn Plax Mushrooms on Rock Aquarium Decor - Small. This classic piece of aquarium decor is crafted of fish-safe, non-toxic resin and offers plenty of room for fish to hide and openings to swim through. 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. Made of non-toxic and fish-safe resin. Intended for both fresh and salt water. Accented with brown mushrooms. Brings a natural environment for your aquarium. Dimensions: 6L x 3W x 4.25H in..