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Table tennis nets are mesh barriers that are used to divide the playing area in a table tennis match. They are typically made of nylon or cotton material and are suspended by a cord attached to two poles on either side of the table. The net is required to be 6 feet long and 6 inches high, with a mesh size not exceeding 15 millimeters. The purpose of the net is to separate the two sides of the table tennis table and ensure fair play by preventing the ball from crossing over to the opponent's side without being struck.