This RAM high strength composite cradle is designed to hold the following devices: Apple iPhone 4 Material: High Strength Composite Ball Size: 1" Rubber Ball "B" Size Note: The "U" in the part number reflects product packaged in poly bag. The cradle includes a set of two nuts and bolts to connect the cradle to any of the RAM compatible mounts. RAM cradles do not include the RAM-B-238U (Diamond Base & Ball) or RAP-B-238U (Diamond Composite Base & Ball), required to attach to the cradle and RAM mounting system. This mount will NOT hold the 1st generation Apple iPhone, iPhone 3G or iPhone 3G S. The RAM-HOL-AP9U will not work with the Apple bumper or any other covers.