Aquarium Magnetic Floating Cleaner Brush Fish Tank Glass Algae Cleaning Scraper Features: Magnetic material has large suction and with streamline design, the product features beautiful shape.  It is easy to use with floating design. Specifications: Size(approx.):small: 9.5*4.2*7cm/3.74*1.65*2.76in(suitable for fish tank around 30cm/11.81in) middle: 11.8*5.5*8cm/4.65*2.17*3.15in(suitable for fish tank around 30-50cm/11.81-19.69in) large:13*6*8cm/5.11*2.36*3.14in(suitable for fish tank around 50-90cm/19.69-35.43in) Material: plastic Packing: box Package Include: 1*Fish tank magnetic brush Notice： Due to the different colours displayed by different computers, the colours of the actual items may be slightly different from the above images. Please allow 0.5-1 cm to be different due to manual measurement. Thank you for your understanding.