Shrewd Optum Ring System (0.019” pin)A Message from Shrewd: The Optum Ring System is the backbone of the Optum system and enables quick and easy configuration of the scope. Keep an ORS ready for 3D, field, and indoor with different fiber sizes and colours and swap between them in seconds. Optum Ring System (ORS) for the 29MM, 35MM, AND 40MM Optum Scope This must be used in conjunction with an Optum Scope. The 29MM Optum uses a different size ORS than the 35MM and 40MM Optum. The 35MM and