Cichlid Stone,Govine Cichlid Stone For Aquarium Breeding Cave For Fish The material is ceramic,it can filter and purify the water. It is suitable for small bream, cichlids when they need a rest or breed. Highly simulation and close to nature, the surface imitate pebbles. Please note that one package includes only one cichlid stone,they can be combined freely and can be also an ecological decoration for your tank. Size: L 120 x W 80 x H 60mm / L4.7" x W 3.1" x H 2.4" the round hole diameter is 33mm / 1.3"