These cork-lined kydex edge guards are made here in LA by RDG.  They maintain a thin profile while fitting a wide variety of shapes.  Because they are so thin, they don't add as much to the bulk of a knife roll.  The cork keeps the fit tight while minimizing scratching (though soft steels can develop light scratching if grit gets inside the edge guard.  If you have a knife shape that is hard to find a saya for, or just want a more economical or thinner profile edge guard, these are for you. They come in sizes fitting edge lengths from 150mm-270mm.