Adjustable Buoyancy Floats for Ultralight Arms As easy as 1 2 3 adjust the buoyancy of your system with StiX Buoyancy Floats for Ultralight Arms. Kit contains 4 Large floats that will attach to your existing Ultralight arms providing added buoyancy. Our floats feature an off-center mounting position so you do not need special clamps. Each float requires 2 inches of arm and may be easily cut for exact fit. Size: 2 5/8" semi-square x 2" long. (1) FUL-3 kit will provide 1.4 lbs. of lift.