K-String The K-String is designed to

The K-String is designed to help give pitchers feedback on the placement of their pitches as well as develop consistent low strikes for all pitches

Unless you are already a pro or a very elite player

change up or something with more movement you want the pitch to cross at knee level

at the knees

K-String The K-String is designed toThe K String is designed to help give pitchers feedback on the placement of their pitches as well as develop consistent low strikes for all pitches. A problem when throwing bullpens is that you don't truly know the exact height the ball is crossing the plate at. The K String let's a pitcher train themselves to always throw the perfect strike, at the knees. No matter if it's a fastball, change up or something with more movement you want the pitch to