This double-sided magnetic brush is made of fiberglass cloth on the outside to remove water stains. High density fiber on the inside, it can easily remove cylinder wall adherents and moss. Complete cleaning without ever getting your hands wet.Features:1. Suitable for 40cm-1.5m fish tank, glass thickness of 4-25mm fish tank. 2. Floating design, after separation, it naturally floats in the water.3. The front and rear arcs are designed to easily clean the corners of fish tank.4. Humanized design, comfortable hand feeling, easy to use.5. Super strong magnetic attraction, great cleaning power.Specification:Item Type: Fish Tank Clean BrushMaterial: Plastic + MagnetColor: Blue + WhiteOptional Type: Small Size, Medium Size, Large SizeTypeSize(cm/inch)Maximum ThicknessAquarium Length (cm/inch)Large10.5 * 5.6 * 9/4.1 * 2.2 * 3.510mm or Less/0.4inch60-150 / 23.6-59.1Medium9.6 * 5 * 8/ 3.8 * 2.0 * 3.18mm or Less/0.3inch40-80 / 15.7-31.5Small7 * 3.8 * 5.7/ 2.8 * 1.5 * 2.26mm or Less/0.2inch40cm or Less / 15.7inch or LessPackage Weight: Approx. 100-262gPackage List:1 * Fish Tank Clean BrushNote:1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!2. Please allow 1-3cm measuring deviation due to manual measurement.