The RAP-300U, RAM Magnetic Power Plate II, is designed to hold various devices including radar detectors and cellphones. The magnetic plate includes one powerful rare earth magnets, rubber cradle and two adhesive metal plates. To mount your device to the magnet, you will need to attach one of the metal plates to the back of you device. Material: High Strength Composite Note: The „U” in the part number reflects product packaged in poly bag. RAM also sells the RAM Magnetic Power Plate III, a larger version of this product.