You can choose according to your aquarium size and fish size. 3-piece net set (S, M, L) targets for aquarium fish tanks. Features: An essential net for scooping fish or removing the floats on the surface. You can choose a variety of sizes according to your aquarium size and fish size. When removing the float, it is easy to scoop with a slight tap on the surface of the water. Quantity: 3 pieces. Size (approx.) S: Width 3.9 x Height 2.8 x Depth 2.8 inches (10 x 7 x 7 cm). Handle Length: 7.5 inches (19 cm). M: Width 5.1 x Height 3.9 x Depth 3.9 inches (13 x 10 cm). Handle Length: 9.4 inches (24 cm).