Innovative Massage Head & Deep-kneading Neck Massage: Made of skin-friendly elastic silicone with a wavy texture to knead the fascia layer, the neck massager nodes simulate hand-kneaded massage by deeply stimulating the muscles to rub away soreness relax and release soreness and fatigue. RENPHO neck massager with heat for neck pain provides a combination of hard and soft force to ease stress. Tip: Use the provided massage node covers on the nodes to reduce pressure if any discomfort is felt.