REALISTIC APPEARANCE & TEXTURE: This Deco-Replicas Stone Aquarium Ornament & Hideaway 8 Piece Set is made from sand of real granite, and is not made of plastic or resin. The texture mimics a variety of rough surfaces found in a fish’s natural environment. You may wish to consider sanding down any areas you feel are too rough for your pet. EASILY STACKABLE: Our granite-like ornaments come in different sizes; this 8 piece set includes 3 Small, 3 Medium, and 2 Large. Stack or arrange these stones however you’d like within your tank. The possibilities and combinations are endless! SUPER SIMPLE TO CLEAN: Simply wipe down and rinse off ornament with warm water when you are cleaning out your tank. Never use soap, as the residual soap particles can harm your fish. It’s safe for both freshwater and saltwater aquariums. MEASUREMENTS: Small (2” x 2. 75” x 2. 5”); Medium (3” x 5” x 4. 75”); Large (3. 5” x 6” x 5. 5”) SHOP PENN-PLAX FOR ALL YOUR PET’S NEEDS: Penn-Plax is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small.