Standard/Smooth Balls: Ideal for controlled, sustained pressure on deep-tissue knots (e.g., lacrosse style).Peanut/Double Balls: Ergonomically designed to straddle the spine while protecting it, or to target narrow areas like the arch of the Balls: Used to stimulate blood circulation and provide a milder, surface-level sensory massage.Vibrating Balls: Add an oscillating mechanism to enhance muscle relaxation and ease tension.