DEWALT Carbon Steel Joint Knives with Soft-Grip Handles offer precision flex and feel for a smoother finish. These knives feature an incredibly strong, high-grade carbon steel blade for superior strength and durability. Carbon Steel blades are often preferred by finishing professionals because they provide outstanding work ability. However, unlike stainless steel, they will oxidize/rust without proper care between uses. We recommend that the knives be cleaned thoroughly then lightly coated with WD-40 or a similar product prior to storage. The knives should also be stored upright while they are drying, to ensure water doesn't collect near the handle.