Group of front progressive springs for XB2 and XB4. These springs are paid down with an available end and very different contemporary faculties. The main element benefit & benefit of progressive springs frequently after the vehicle initially switches into the part the springs work like softer springs to provide maximum traction. Because the framework starts to roll during the corner, the springtime rate progressively increases until it works like a stiffer springtime that allows the vehicle to maintain maximum cornering rate. XRAY springs, are by hand calculated, chosen, and matched into pairs to make sure properly equal length and damping faculties. Each spring is laser-engraved with stripes to aim the tone, the more number of strips, the stiffer the springtime.