Scrapers need to be steel to hold a proper edge. The best Ihave ever had were made from stove pipe material. You can cut it with good sheetmetal shears to any shape.I got some ornamental sheet metal from the hardware store that's pretty thin and flexible. They all carry the same selection from KS Precision Metals. One brass 4x10 .010 and one aluminum 4x10 .016. I hope to try them out as a scraper for curved surfaces.