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 Brush Material: Plastic + Magnet Color: Blue + White Optional Type: Small Size, Medium Size, Large Size Type Size(cm/inch) Maximum Thickness Aquarium Length (cm/inch) Large 10.5 * 5.6 * 9/4.1 * 2.2 * 3.5 10mm or Less/0.4inch 60-150 / 23.6-59.1 Medium 9.6 * 5 * 8/ 3.8 * 2.0 * 3.1 8mm or Less/0.3inch 40 -80 / 15.7-31.5 Small 7 * 3.8 * 5.7/ 2.8 * 1.5 * 2.2 6mm or Less/0.2inch 40cm or Less / 15.7inch or Less Package Weight: Approx. 100-262g Package List: 1 * Fish Tank Clean Brush Note: 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.