Cobalt-based alloys L605 and MP35N with a small grain size, high density and a high modulus of elasticity for orthopaedic instruments, cardiovascular stents and heart valves; medical stainless steels with outstanding biocompatibility, high elongation in the soft condition and small inclusion size. Outer diameter 0.200 to 30.00 mm, wall thickness 0.025 to 1.20 mm.