The Hobby Jumbo Aquarium glass cleaner is a extra-strong algae magnet, which removes algae from aquarium glass easily, leaving no traces. Used like ordinary algae magnets. Blade made of high quality, stainless V4A steel, as used in ship-building. Guaranteed not to cut the silicon joints and does not scratch the glass. Dimensions: approx. 8.3 x 3.3 cm.Do you have questions about this article ?