The Kent Marine 24 inch ProScraper w/ Plastic Blade is made of industrial quality ABS plastic and is ergonomically designed for the hand.Won't scratch acrylic or glass like metal bladesSoft enough to reach into and clean out previously scratched glass or acrylicWill clean out algae that naturally grows in such scratchesWon't cut the user, even if just carried in your pocketEffective on even the most stubborn deposits