PhotoTrust Adjustable Lens Gear Ring with Metal Handle for Canon, Nikon, Pentax, Panasonic, Sony, Samsung, Olympus, Fujifilm DSLR Follow Focus Ring + PhotoTrust Microfiber Cleaning Cloth Easy installation to camera lens Adjustable to any lens circumference Can be applied to Focus ring or Zoom ring Made of smooth rubber Used for DSLR follow focus rig systems