The product is a set of 1000 oval-shaped 50mm green Koi Carp insulation cover balls by the brand Euro-matic. Made of plastic, these UV-resistant cover balls are suitable for use in Koi ponds, aquariums, ponds, and hot tubs. They are flexible, easy to install, and safe for fish. With a length of 0.05m and a weight of 9.3kg, these cover balls are designed for efficient insulation and are a practical and visually appealing addition to any water feature. Originating from Hungary, these cover balls offer a reliable solution for maintaining water temperature and creating a safe environment for aquatic life.