This is the 0.025" Diameter Music Wire from K+S.

FEATURES: Steel construction
Silver in color
Ideal for a variety of uses such as crafts, jewelry, model cars,
boats, trains, etc.

INCLUDES: Four Pieces of Music Wire

SPECS: Length: 12" (305mm)
Diameter: 0.025" (.6mm)

K&S

Part K+S5005