Using this slicer is a breeze. First, place the onion or tomato on a stable surface. Then, firmly hold the easy - to - grasp handle of the slicer and press it down on the produce. The slicer will cut the onion or tomato into even slices. Remember to keep this tool away from children to avoid any accidents. For maintenance, simply wash it with warm soapy water after each use. Since it's made of stainless steel, it's quite durable, but try not to use abrasive cleaners that could scratch the surface. If the factory sends a random color, don't worry, it's all about the great functionality of this slicing tool!