Down Press Clamp Straight Rail (for 350-CS and 550-ES) Tourna Air Cell is a

Tourna Air Cell is a Tennis Elbow Brace that uses pneumatic pressure to relieve the pain

HEAVY DUTY and DURABLE

Use for batting practice and ball machines

Lightweight and Durable

making it easy to track the trajectory and perfect for use in various lighting conditions

Down Press Clamp Straight Rail (for 350-CS and 550-ES) Tourna Air Cell is aDown Press Clamp base Straight Rail fits the 350 CS and older 300 CS machines, and the 550 ES Includes one rail and one clamp base Excludes clamp Sold one at a time. Select 2 for a pair. Warranty voided if clamp is separated from the rail Not a universal fit for other stringing machines