1/4ozt silver solder paste. SS75 (75% silver), 1450° F flow point. Built-in flux (self fluxing). 10cc dispensing syringes are perfect for precise application. Two sizes of tips included. Cadmium free. Shelf life is approximately 2 years (from manufacture date on package) if stored in a cool dry place. This solder paste is a blend of solder powder, flux, and binder. With a syringe, you can apply the exact required amount, eliminating waste and improving the appearance of the joint area. Use this hard grade silver solder when manufacturing jewelry, or for the first solder join in a complex piece. This allows repairs or other future solder joins to be made with easier grades of solder.