Flipper 2-Piece Replacement Stainless Steel Blade for Nanoglass Tanks Flipper Nano Stainless Steel Replacement Blades (for glass tanks only) Patented design that flips from scrubber to scraper, Complete cleaning without ever getting your hands wet 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 Blades are replaceable