Features: 1. Handle: Human engineering bionics handle design. Fits the hands, comfortably, and brushes freely. 2. Inner Brush: When you move the other part of this cleaner, the inner brush will move simultaneously and bring the dirt together. Easy and no damage to tank. 3. Rubber Scrapper: Clean the green algae which is on the glass and corner by an easy wipe without getting wet and disturbing fishes. Convenient and labour-saving. Glass-friendly. 4. Outer Soft Cloth: Ultra soft micro fabric, clean the outer glass of the fish tank with less efforts. Easy to clean and dry. 5. Durable: Made of high quality ABS material with magnetic part design. Super strong magnets for use with varying glass thicknesses. Precautions 1. Please be careful not to entrain tiny sand when brushing on the side of the cylinder bottom to prevent scratching the inner wall of the glass. 2. Please do not place the magnetic brush in a high temperature environment. It is well known that high temperature can demagnetize. 3. After use, please clean the brush surface, remove the water and dry it, and place it in the original box. 4. This product has strong magnetic force and has certain safety risks for young children. Please try to keep it out of the reach of children. 5. Before use, please check whether there are small and acute metal objects such as staples next to it, to prevent it from being attracted to the brush surface and inadvertently scratching the glass. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material: ABS, Magnetic part Battery: No Color/Style: As the picture shown Application: for Flat Glass, Window, Aquarium Size Compatible Glass Thickness: Small SB-6---95x42x70mm, fish tank in range of 30-40cm , applicable glass thickness within 3mm Medium SB-8---118x55x80mm, fish tank in range of 40-60cm fish tank, applicable glass thickness within 6mm Large SB-12---130x60x80mm, fish tank in range 80-100cm fish tank, applicable glass thickness within 10mm Extra large SB-20---145x75x90mm, fish tank in range of 120-160cm fish tank, applicable glass thickness within 15mm Package List: 1 x Aquarium Cleanerset