Standard badge SS (one empty, one with runes). Size 35 to 50 mm. BeVo technique. Сollar tabs are woven by the machine, the runes are ivory-white on a black background. Linen canvas backing: resilient, but not "wooden", very high quality workmanship. The color and texture of the substrate may differ from the photo, but it remains within the historical correspondence. We can make a photo of your pair of collar tabs on request.
How to sew collar tabs on? Put a collar tab on the collar of the field jacket so that it is not less than 5 mm from the edge, and if you plan to make the unter-officer edging, then not less than 10 mm. Fix it with a bright thread (which then remove) or glue. When collar tabs sit properly, they need to be sewn with a black thread over the edge. Before the war, the SS units got their jackets without insignia, and then soldiers sew it themselves or with help of tailors. During the war, collar tabs were sewn on a machine with a straight seam along the edge, at the factory.