Earring tension spring
The earring tension spring is equipped with earring-type sheet-shaped hooks at the two ends of the spring body,
which is convenient for the dentist to place and remove the tension spring, and has various forms of earring spring combination.
Ordinary tension spring
The common tension spring pulls out the 1-2 ring spring body at both ends of the spring body as a hook so that it coincides with the central axis of the entire spring.