StiX's 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. StiX's ball ends are made from strong, chemical, and UV resistant composites. StiX's strobe arms are made from 40,000 psi tensile aluminum with a black hard anodized finish.