These lens covers cover the objective end of Nikon Prostaff 3S 10x42 binoculars, but they may be compatible with other 42mm binoculars.

I got sick of having to put my lens covers in my pocket like a peasant. These covers just flip down when not in use. The magnetic version even keeps the covers out of the way.

 These need to be printed in TPU. No supports are necessary. The Magnetic version requires a total of 4 8mm x3mm circular magnets.