• USA made spring.
• These Closed Coil Springs deliver ideal forces for space closure maintenance applications, including Class II intra-arch maxillary retraction.
• True progression of forces in springs from light to to medium toheavy with no overlap between tolerance bands.
• Stainless steel keys are secured at each end for easy application to hooks.
• Offered in two lengths – 9mm and 12mm.
• Force levels: Light = 150gm, Medium = 200gm and Heavy = 250gm
• 10 springs per pack.