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For use with 14 watt, 15-inch tubes, 15 watt, 18-inch tubes and 20 watt, 24-inch tubes. Fluorescent starters are used to help the lamp light and to not flicker. Replacing a starter is recommended if tube is not completely lit or tube continues to flicker. If the tube is discolored on the ends, then replace the tube. Each starter measures 1 1/2""L x 3/4"" in diameter.