This soft vinyl strip is commonly used on many canned ham trailers, like mid-50s Trotwoods, to cover the seam between a wall and a ceiling inside a trailer. The long flat flange is either nailed or stapled to framing or another hidden surface. The curved flange bends backwards to create a cove finish. The flat flange is approximately 7/8" wide along the bottom but the inside measurement of that flange is 3/4". The curved top flange is 3/4" wide on the exposed exterior.
The vinyl is BONE in color. Sold in 25 or 50 foot lengths.