15" StiX System Arm without floats. Our unique removable ball end design allows you to add up to 36 ounces ( 1 kg.) of flotation to this arm; however we usually recommend that this arm be populated with SF-1 floats. Our ball ends are made from a strong, chemical, and UV resistant composites; this material allows a design without "O" rings and a very smooth feel. Our strobe arms made from 40,000 psi tensile aluminum with a black hard anodized finish. Length: 15.3 inches ACCEPTS 6.5 FLOATS travel weight: 3 ounces ( 85 grams).