US Blade 100 #9 Single Edge Razor Blades are thinner than standard blades. Constructed from .009 high-carbon surgical steel and designed to fit into all standard scrapers and tools that use Single Edge razor blades. Excellent for audio and video tape editing, can be used to scrape, trim and cut paper, plastic, board, wallpaper, glass, and more. Made in the USA. 100 per box.