Extension Spring, 302 Stainless Steel, Inch, 1.5" OD, 0.177" Wire Size, 6" Free Length, 9.4" Extended Length, 101.54 lbs Load Capacity, 27.24 lbs/in Spring Rate (Pack of 10) Slightly magnetic stainless steel 302 per ASTM A313 for greater corrosion resistance than steel music wire Full twist loop ends for secure fastening Load capacity of 101.54 to 121.9 pounds Maximum operating temperature of 500 degrees F (260 degrees C) Passivated for enhanced corrosion resistance