Made of super strong magnet and plastic, durable and practical.Strong absorbency and strong magnetic attraction.When you move the outer magnet, the inner magnet follows to remove floating algae faster and easier. Easy to clean. When you move the outer magnet, the inner magnet follows and thus cleans the glass. Have fun cleaning. Br> The improved soft grip is contoured, non-slip, comfortable, space- and time-saving. Note: Not suitable for acrylic aquariums and low-iron glass aquariums. < Br> Floating design: The inner brush does not sink into the deepest depths of the aquarium. Easy to use. < Br> Strong magnet for use in tanks of different thicknesses (less than 4mm).< Instructions for use: Step 1. First place a piece without handle in the aquarium, then place the brush with the handle outside the aquarium, keeping the absorption state of the two brushes in mind. Br> Step 2. Start moving the outer magnetic brush to drive the magnetic brush into the aquarium to clean the wall of the
