The Arrk Iso Float GJ shape series are made with an emphasis on stability and is best used in areas with a lot of white wash or high current. The 031Y/033Y size is best used when casting long distances to reach areas that are hard to reach with your standard (27mm) size floats. The GJ-033Y is a larger model than the 031Y which is only available in the size 1.5 and 2.0 and is meant for distance casting with and Iso set up.