These are blank viewmaster reels (personal reel mounts). These reels were originally produced by Meopta, for putting in your own pictures. These reels are exactly the same as Viewmaster empty reels. These are used to put in images you make with a viewmaster camera. For example the View Master Personal Camera, the Mark II and the Czech Meopta Stereo 35 and Stereo Mikroma. The reels are in very good shape. They will serve well for putting in your viewmaster pictures. These come with blank sleeves.
These empty reels are sold in sets of 10.
1 set of 10 is posted affordable in an envelope, without tracking. More than 1 set is sent in a package, with tracking.