Horolovar .0018" - .046mm thick 3 pack single strength temperature compensating 400 day clock pendulum suspension springs. 3 springs per package. Each spring is 5-3/8”long. Horolovar torsion anniversary clock suspension springs are available in 24 different strengths. 

These suspension springs are the correct thickness to regulate Haller midget movement clocks. 

We can help you find the right suspension springs for your clock, assemble your suspension unit to the proper dimensions, install the suspension unit on your clock, and put the clock in beat. Any questions, just ask!