These Front Cine Spec Rings are made specifically for the Cooke SP3 line of lenses. Each Cine Spec Ring is made of solid aluminum and has a knurled edge for extra grip and function when mounted to a matte box.  The Cine Spec Ring contains a custom engraved Cooke Logo, focal number and f stop, as depicted in the photos.
 
You must purchase the Cine Spec Ring to correspond to the size of the cap.  CineSpec Rings are available in 80mm Outer Diameter (O.D and 85mm O.D.
 
The full set includes a rings for the following five (6) lenses:
18m / 25mm / 32mm / 50mm / 75mm /100mm
 
To purchase the matching set of Cooke SP3 caps, please click HERE