Features: 1.No damage to the glass, easy for cleaning, wear resistant and durable algal removing knife. 2.Anti-scratch sticker, when moving the downy brush, hook on the inner brush catch the garbage and algae stuck to the cylinder body. 3.Magnetic brush and scraper can used replaceable, one brush for two uses. 4.Suspension design to prevent the magnetic brush from sinking to the bottom of the cylinder. 5.Non-slip handle design, easy to operate and convenient to use. Specification: Item Type: Aquarium Magnetic Brush Optional Mode: ZY-01S, ZY-01M, ZY-01L, ZY-01XL Material: ABS Color: As Picture Shown ModeSuitable AquariumGlass Thickness ZY-01S20-30cm/7.87-11.81inchBelow 5mm/0.20inch ZY-01M40-60cm/15.75-23.62inch5-8mm/0.20-0.31inch ZY-01L60-100cm/23.62-39.37inch8-12mm/0.31-0.47inch ZY-01XLAbove 100cm/39.37inch12-15mm/0.47-0.59inch Usage: Due to the strong suction of the product, rotate the two surfaces of the brush to 90 degrees before opening, and then forcibly break them apart to avoid pinching fingers PackageList: 1 x Aquarium Magnetic Brush 2 x Scraper Note： 1. Keep the wearer of a pacemaker away 2. Place out of reach of children