Designed for use with Pilates reformer equipment, this product serves as a perfect replacement for the original springs. Key benefits - Replaces worn or degraded springs on your reformer to restore proper tension and feel. - High quality springs built for reliable performance and durability. - Additional springs provide greater resistance to enhance exercise results. - The primary spring is designed for use with the first spring set. - Dimensions are designed to match your nib sizes. Use scenarios - Replacement use: Swap out old springs on your Pilates reformer to restore original operation and contact feel. - Increased resistance: Add extra springs to increase resistance for more challenging workouts. - Progressive training: Combine the primary spring with optional additional springs to tailor resistance across routines.