RAM Flex Adhesive Base w/1" Ball Part #: RAP-B-378U Consists of a 2.5" composite base that connects to a 1" ball, double-sided adhesive PSA stick pad and sealed alcohol prep pad. This base will attach to all RAM double socket arms that will accommodate 1" ball bases. Material: High Strength Composite Ball Size: 1" Rubber Ball "B" Size Note: The "U" in the part number reflects product packaged in poly bag. A secondary tether is recommended when this mount is used in high vibration environments.