The Penn-Plax 8-Piece Stone Hideaway Aquarium Ornament is a great choice when it comes to decorating your fish tank. This ornament features swim throughs and hides, with a texture that mimics a variety of rough surfaces found in a fish's natural environment. It is durable, realistic in nature and safe as well. Add excitement and imagination to your underwater world with this amazing piece from Penn-Plax. Features: 8-piece stone hideaway Swim throughs and hides For tanks 2.7 gallons and up Includes: 1 Aquarium Ornament Materials: Resin Color: Grey Product Dimensions: Small (2 in x 2.75 in x 2.5 in); Medium (3 in x 5 in x 4.75 in); Large (3.5 in x 6 in x 5.5 in) Product Weight: 12.50 lb Capacity: For tanks 2.7 gallons and up Instructions: Before placing into your tank, or as you as perform regular cleaning and maintenance, simply wipe down and rinse off the ornaments with warm water. Caution: Never use soap, as the residual soap particles can harm your fish. Penn-Plax Penn-Pla Stone Hideaway Aquarium Tank Ornament | PetSmart