The Discovery Eyeshade is made of Medical grade Silca Gel, not rubber. Silica gel is tear resistant, temperature resistant and has no odor.
Designed for fitting 38mm-48mm diameter of the eyepiece with no attachments.
Relieve Eye Strain by Blocking Glare or Enhancing Low Light and improve target focus by eliminating distractions from peripheral vision.
Eyeshade design enables quick eye positioning for correct eye relief and optical center alignment to enhance target acquisition and sighting accuracy.