Portable back massage cushion ZV-4502 1. PU leather as cover material. 2. 4 kneading massage balls Portable back massage cushion ZV-4502 Features:1. PU leather as cover material.2. 4 kneading massage balls provide soothing relief in your back,lumbar.3. using DC adaptor, output: 12V, 1200mA. Packing:product size: 35.5x12x34cm20FT': 1472pcs40FT': 3052pcs