Size 72mm, hardness 50-55 for normal massager, hardness 70-75 for
deep massager.

Benefit
Use the massage ball with resistance sitting down, lying on the ground, or
leaning against the wall. Helps you work out knots, trigger points and sore
muscles after intense workouts. Could be used individually or plus strap for
pulling purpose.

SGS-ASTM, SGS-EN71, SGS-SVHC tested certificate.