STRIKE STRINGS KIT (WITHOUT POLES) Strike strings is a pitcher's training aid that provides strike zone visualization and has the advantage of providing immediate feedback for your players. It uses high visibility elastic strings to outline the strike zone. This is the only baseball pitching target that allows a true "pitch through" to the catcher making this a great training aid for both pitchers and catchers. The flexible strike strings eliminate deflection for catcher safety and a true look at the pitch. Great for pitching practice, and training baseball and softball pitchers of all ages and skill levels.