DURABLE MATERIAL: The floating astronaut decoration is made of durable resin, suitable for fresh water and salt water, not easy to fade. This material is soft and no sharp edges, don't worry about hurt any fish ADJUSTABLE POSITION: Uses the floating ball to allow divers to dive without sinking to the bottom. The package contains floating balls and 1 fishing line of adjustable lengths. The diving position of the diver can be adjusted according to the length of the fishing line. The floating ball can be opened. If you feel that the diver is sinking too fast, you can add water to the floating ball appropriately MULTIFUNCTIONAL: As an fish tank decoration, I hope it will make the aquarium beautiful and add fun to your life at the same time. In addition to being a fish tank decoration, the floating astronaut can it can help you observe the water flow direction of the fish tank LOVELY AQUARIUM DECORATION GIFT: Astronaut decoration is suitable for most aquarium landscapes, it also applies to small fish tanks. The lovely appearance makes him applicable to a wide range of people. It can be used as exquisite gifts, suitable for Christmas, Valentine's day and other festivals MATERIAL & SIZE: Material: resin Overall size: approx. astronaut: 2.76 x 1.97 inches/70 x 50 mm (L x W) floating ball diameter: 1.97 inches/50 mm.