Theyre recommended to alleviate arch and heel pain

Helps target tightness within back

Outsole: Vibram rubber outsole provides high-level traction and durability

and a random oscillation

Lobster Elite Grand Four Machine Type_Kids' Squash Racquets Theyre recommended to alleviate archThe Lobster Elite Grand Four Machine is the world's most advanced battery operated portable tennis ball machine. The Elite Grand Four offers unrivaled full random triple oscillation. This revolutionary design allows the machine to throw balls throughout the court spectrum, mixing up speed, spin, trajectory and oscillation. Triple oscillation allows the machine to oscillate vertically and horizontally, allowing for random shots simultaneously.