Brock String - Vision Convergence Training Tool - Train Vision, Improve Strength & Athletic Performance, and More!

Improves convergence & performance: Convergence training using a Brock string can be useful for convergence insufficiency, as well as strength and athletic performance. Sports Performance: With a 6-foot long string and tight-fitted Brock beads, this string is great for training the eyes in sport-specific positions - giving you the ultimate athletic edge. Easy to use: You can use Brock string right from the comfort of your home with a very short learning curve involved. High quality: This Brock string is designed with an extremely high quality, and highly durable string and beads.