Specially profiled shells matched with the shape to the outer corners of the eye prevent the lateral light from entering the user's eyes. They knock on getting images with the highest contrast in all conditions. Made of soft rubber ensure high comfort of use. Especially recommended during astronomical observations the range of artificial lights, for hunters and bright, sunny days. They are fitted instead of standard straight eyecups. Dedicated to FUJINON FMT / FMTR binoculars