Penn Plax Mythical Magic Castles Aqusarium Ornament, adds mystery and intrigue to your aquarium decor. Made with resin to be durable and attractive in water. Available in 3 size options. Dimensions: Small: 3L x 3L x 5.5H inches Medium: 4L x 4W x 7H inches Large: 6L x 6W x 9 inches 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.