Apple iPhone 4 / 4S Suction Mount This RAM high strength composite mount is designed for the following devices: Apple iPhone 4 Apple iPhone 4S Material: High Strength Composite Ball Size: 1 inch Rubber Ball inch B inch Size Components: RAM-HOL-AP9 RAP-B-238 x 2 RAP-B-201-A RAP-224-1 Please Note:This holder is not suitable if you are using a case / skin with your iPhone. We recommend the X Grip if you are using a case.