Optiline Opti-Brake Pro Titan The Optiline Opti-brake Pro Titan is specially made to mount your phone holder on the brake reservoir. It is made of eem heavy metal die-cast construction. The rubber ball reduces shock and vibration. It also has an adjustable mount for a better viewing angle. It can be used with all Optiline cases. It also has a duo-lock system. - Optiline Opti-Brake Pro Titan Size