Flipper Nano Magnet Cleaner, 1/4 Inch Flipper Nano can be used on small glass tanks up to 1/4" (6mm) thickness or 25 Gallons Patented design that flips from scrubber to scraper with replaceable blades Unique orienting buoyancy for easy retrieval of the cleaner every time. Ultra low profile design allows cleaning in hard to reach areas of the tank. Scraper/Scrubber Dimensions 3.5 X 1.5 X .5 inches