Made of high quality silicone material, which is harmless, environmental friendly and non‑toxic. Special artificial coral shape, through exquisite craftsmanship, it is lifelike in fish tank. The silicone material's touch feel is soft and comfortable, fish can swim around without hindrance. These silicone aquarium ornaments have glowing effect thus produce different visual effects for fish tank. It is also acid and alkali resistant, which makes it can absorb fine dust that cannot be filtered.