The adjustable self massage balls comes with a unique anatomical design. The textured contoured surface of the balls stimulates circulation. The connected design gives stability during use, whilst the adjustable widths enables adjustment to target both sides of the entire spine. The balls on each end can be detached to reveal treatment knobs. These knobs at the end of the connecting rod enables application of focused pressure to trigger points. The adjustable massage balls are great for rolling out tight muscles, help increase circulation, soothes sore muscles from injury/post workout and relieve painful trigger points. Lightweight and easily portable, it can be used for all body parts including neck ,back, shoulders and limbs.