Orange Transparent 14mm Glass Marbles Pack of 20 Wondertrail WONGM002 Orange Transparent 14mm Glass Marbles Pack of 20 Wondertrail Useful in games and Useful as replacement marbles in games. Each bag contains 20 glass marbles. Glass marbles are 13-15mm Approximately 9/16 inch in size. NOTE: Colors may vary slightly depending on your monitor settings.