Perfect decor for shaping of both aquaria and terraria. They are easy to clean and do not affect the water quality. Navajo Rocks are very durable and look beautiful in every aquarium and terrarium. Our Navajo Rocks are near-nature rocks which ensure a natural look inside the aquarium. As they are manufactured from a safe inert poly resin material they affect neither the chemistry nor the clearness of the water. Their low weight obviates possible damage to the aquarium. Available in two sizes (sizes are approximate and may vary): Small - 22 x 11 x 17cm and Large - 23 x 15 x 21cm.