Features:

• Chrome silicon steel for high strength, consistency, and long life
• Cold wound, heat-treated, and shot-peened ensures consistency, accuracy, and durability
• Squared ends - ground at both ends to ensure straight, consistent and accurate operation
• Lengths and rates are clearly marked with the free length of the spring and spring rate for quick and easy identification
• Lifetime guaranteed to remain within 2% of the original free height and rate under normal operating conditions
• Made in the USA