4" StiX Float Arm with 1 4.2 oz. lift StiX 4" Arm with one SX-150 Float fully assembled. Most digital cameras are heavy enough to require a nearly maxed-out float arm. This is our shortest arm with our largest float making it ideal for focus lights. This arm provides 4.2 ounces (120 g.)of net positive bouyancy with a travel weight of less than 2.5 ounces (75g.).