Having a range of springs in varying thicknesses is mandatory when you are tuning a machine.
The Tru-Spring Polished Spring Kit contains 44 springs in total including two front and two back springs in the following thicknesses: 0.013", 0.014", 0.015", 0.016", 0.017", 0.018", 0.019", 0.020", 0.021", 0.022", 0.023".
Made in Canada.