Qwikie Tri scraper is designed to use for painting, automotive, marine and workshop. Made from durable composite plastics. Safer to use than a razor blade. Will not rust or corrode like a razor blade. Will not mar softer surfaces like wood, dry wall, plastic, or fiberglass and is good for glass cook tops and granite counters. Will not scratch your paint or glass and is a perfect choice for household, construction, marine, and automotive jobs. 3-edge 1.5 inches long blade design. Blue blade is designed for soft, delicate surfaces and materials, works great for curved surfaces. Yellow blade is designed for rougher, tough surfaces and materials, perfect for stubborn substances. Includes 5 composite blades (3 yellow and 2 blue blades, 15 edges). 2.25 inches long handle.