It's one of [these](http://www.RAM.com/ MOUNTS (RAM-B-132U 1" Diameter Ball Mount with Round Base, Self-Leveling Cup Holder & Cozy https://www.amazon.com/dp/B003A8CPWK/ref=cm_sw_r_cp_apa_i_ErCLDb7WJTS94) with a 1" ball mount on the handlebar