Octorox Spiky Massage Ball set contains three 3-inch balls: firm, medium and extra-soft choice of intensity You can apply different balls to the parts of the body that require different squishiness and pressure gradually and comfortably increase the firmness of the massage balls to keep tension under control Use anywhere The balls are lightweight and easy to carry Bring and use them anywhere: at home, in the office or while traveling Environment-friendly All the balls are made from durable, recyclable rubber-like material (7P-free PVc) and have no odor All-body Firmness of each ball has been pre-configured - firm, medium and soft balls cover the most popular uses: foot, back, hand, neck, shoulder, muscle, fascia massage Fine-tunable To adjust the massage ball firmness even further, you can use a regular ball pump to add or release air (ball pump not included) How to use them Sit or lie down on your massager ball and employ your body weight or apply pressure by hands to an affected area consult your doctor or physical therapist if youAve had a recent injury or trauma Features of the balls Orange ball is soft and squishy This is the ball to use on the most sensitive muscles or to squeeze in your hands for finger sensitivity and control Its long and flexible spikes deliver pleasant sensations and increase blood circulation Yellow ball is of medium firmness with medium hardness spikes Use it on the areas that you do not want to compress too hard, but still want the spikes to effectively increase blood flow and relieve tension Red is the firmest ball It applies the most pressure It has the hardest spikes It eliminates muscle knots If you press hard enough, it will reach deep tissue and deliver that famous myofascial trigger point release