The Ram X-Grip Is One Of The Best-Selling Phone Mounts On The Market, Providing A Secure Hold In Nearly Any Environment. In Demanding And Open Cockpit Applications Where Excessive Wind And G-Force Could Cause Movement Of Your Phone Within The Holder, You Can Ensure Added Peace Of Mind With The Ram X-Grip Tether. Its Also Great If You Just Want A Little Added Stability And Vibration Control When Capturing Video While Your Phone Is Mounted. The Tether Is Made Of High-Strength Elastomeric Material And Fits Around The Large Ram X-Grip Holder For Easy Attachment To Your Phone.