The design that improves your speed. The ZRE original Stand-Up Power Surge blade design is curved at the bottom blade, and is slightly concave on the power face for a quick catch.The rib design assures positive tracking through the water, eliminating flutter. The ZRE Stand-Up Paddle is lightweight from 13 to 14.5 ounces. The stiff, one piece carbon fiber shaft is tapered oval, providing strength, comfort, and positive tracking.