[High-density soft brush] The fabric of the magnetic fish tank brush is soft, not easy to tear, and wear-resistant. It can be used to scrape off algae, moss, dirt, and other debris, and is safe for aquariums. It cleans the tank thoroughly without leaving residue. [Easy to use] The shell is made of high-quality plastic material, providing a comfortable grip, seamless design, and anti-slip and waterproof performance. When you move the external magnet, the internal magnet follows its movement, allowing for easy and complete cleaning. [Powerful magnetic force] This mini magnetic fish tank brush is lightweight and compact, with strong magnetic attraction and durable construction. Suitable for glass thicknesses of 3-6mm (0.12-0.24 inches), it works well on both square and round tanks. [Comprehensive cleaning] Using this magnetic brush, you can clean both the inside and outside of the aquarium glass without submerging your hands, saving time and effort while improving cleaning efficiency. [Package includes] You will receive 3 mini magnetic fish tank brushes: 1 blue, 1 white, and 1 black. The set provides long-lasting use and convenient replacement options.