Product Attribute Type: Eyecup Compatible Brand Canon Compatible Camera Style: DSLRs Model Number: one size Bundle: Bundle 1 Package: Yes Product Name: Eye Mask Model: EF Material: Rubber amp, Plastic Replacement: Original Canon EF Support Canon's following camera models: CANON EOS 300D CANON EOS 350D CANON EOS 400D CANON EOS 450D CANON EOS 500D CANON EOS 550D CANON EOS 600D CANON EOS 1000D/1100D/700D/100D CANON Digital Rebel XSi, XTi, XS The eye mask is mainly used to prevent light from entering the eyepiece during long-time bulb exposure, and necessary to take pictures, it also prevents the eyepiece from being scratched when the camera is not used, it prevents the debris from entering the viewfinder when the camera is stored. How to use eye mask or extender? When using, remove the rubber eye cup first, then insert the eye mask or the extender into the external card slot of the viewfinder. Packaging Details Unit Type: piece Package Weight:0.011kg (0.024 lb) Package Size:25cm x 15cm x 10cm (9.84in x 5.91in x 3.94in)