Description *Environmental resin material, durable, nature, safe and eco-friendly, harmless to all fish. Also with the function of filtering and purifying water quality. *Long time in the water will not fade, easy to clean. *Natural cobblestone shape, vivid colors, realistic image not only become more attractive to your fish , but also add life to your aquarium. *It can be freely combined, perfect decoration for the fish tank or aquarium.Create a natural living environment for fish. *Applicable to sea water, fresh water, provides shelter, hiding spots, entertainment venues for the fish and Cichlid. Aquatic Decorations Type: Decorative Marbles Material: Resin Color: As the picture show Size: 9.5*7.5*5cm/3.74*2.95*1.97". Round hole diameter: 3.5cm / 1.38 " Quantity: 1pcs Package includes: 1 x Resin Stone Cave Aquarium Ornament Note: 1. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! SAFETY MATERIAL: Made of natural, fine and tiny compressed sand, with very flat and smooth surface and edges, and definitely very safe for your fish also it can filter and purify the water. It is suitable for small bream, cichlids when they need a rest or breed. FEAST VISUAL: This hideaway cave provides visual feast for you and a “house” for your fish. The rock caves allowed to stop in for a visit or a hideaway to rest or hide reducing stress and minimizing aggression like Cichlid, also a perfect place for Betta , Crayfish , or Crustaceans. 【Quality & Professional】The aquarium cave is made of ceramic with the function of filtering water. And it is environmentally friendly and odorless. Imitate the natural stone texture to create a more natural visual effect. 【Visual feast】 Aquarium decorative hiding cave provides you with a visual feast. Provide a "house" for your fish. The hollow caves provide shelter, hiding spots, and spawning, privacy for your fish, like Crayfish, Shrimps, Betta, Cichlid, Hermit Crabs, or other Small fish. 【Multiple Placement】 The top of the rock cave is flat and can be stacked. You can also place two caverns separately according to your preference. To achieve the best fish tank decoration effect.