Sea urchin size: 10cm in diameter (medium size) Single product weight: 75gThe artificial sea urchin is made of TPR material, which is safe and environmentally friendly, healthy and non-toxic, strong and durable, not easy to break , smooth, soft and elastic, and safe and convenient to match. When you use it for the first time, put it in the fish tank for three days, then change the water, then put it back in the water for 3-7 days. Aquarium landscaping decoration simulate sea urchins with more beautiful lights. The light will change through the silicone tentacles, which simulate the environment of corals and other aquatic plants on the seabed. (Safety: This product does not contain a fluorescent agent and will not emit light.)This product is suitable for: decorating the aquarium and enriching the aquarium environment. Small fish nest, nice decoration of the aquarium. The bottom weight is fixed and will not be washed away.Product DescriptionPackage includes: Artificial silicone sea urchin fish tank decoration*4Color: Green Orange Yellow PinkImitation sea urchin decoration, enrich your fish tank and give the little fish a nest toy. Enrich the aquarium environment and build a water garden. The appearance is smooth, soft and elastic, and can also be used as a toy for small fish. Main function 1. Provide total shelter for light-sensitive and shy fish. Play the role of cooling and reducing light.2. The eggs of some fish must be attached to aquatic plants to hatch.3. Beautify the aquarium environment. Highlight the crystalline body of the fish with greater transparency.