Kuryakyn ISO Throttle Boss (BLACK) Added to the popular Kuryakyn ISO-Grips, this little jewel can make all the difference in the world on a long ride. The Throttle Boss is a small, adjustable paddle that is positioned under the palm of the throttle hand allowing the driver to slightly relax their grip on the gas and still maintain a constant speed. Fits all Kuryakyn ISO-Grips, ISO-Flame Grips, Transformer Grips - left or right grip. Sold individually. Note: Grips NOT included.