Everybody is different, and Bishop understands that, if youre a lighter skier or just love that knee to the ski turn, theyve developed a softer and more responsive spring to customize Bishop BMF telemark bindings to your turn. These springs work with both the BMF/R and BMF/3 bindings. Four springs are included, enough for one pair of bindings. These springs are 30% softer than the standard spring. They will give you a lighter feel, quicker lead changes, and allow you to flex your bindings a bit further.