18ft extreme Series 3 (new extreme, can be clamped anywhere) 760 grams bare pole.
18ft extreme Series 2 (older extreme, can be clamped top,middle and bottom) 790 grams bare pole.
Alex said the weight saving is around 5% so 40 odd grams. Weight saving will be the lack of metal bands on the extreme 3
The reason for the two tables is they list extreme poles (series 2) and the new extreme (series 3)