UDTEE Brand New Mag-Float Glass Aquarium /Pet Fish Tank Cleaning Tool/Cleaner/Brush Package included:1PCS fish aqurium mag-float cleaner. Dimensions(L*H*W):7*6.8*3.7(cm),fits aquarium in 30-50cm It is made with two parts:One is used on the outside of the aquarium,the other is absorbed on the inner side glass because of its strong magnetism.Then,move one part,the other one is also moving. Its buoyancy makes it easy to operate and is easily guided around corners without sinking Let your fish tank more clear and beautiful.