Wrigley's Extra Dessert Delights Rainbow Sherbet Sugarfree Gum. Artificially flavored. 15 sticks. 35% fewer calories than sugared gum. Calorie content of this size piece has been reduced from 8 to 5 calories. Questions Comments Call 1-800-WRIGLEY (1-800-974-4539). www.extragum.com. 2012 WM. Wrigley JR. Company.