PSOAS Muscle Release Tool: An acupressure tool that uses Shiatsu technique which applies deep pressure to trigger points to improve circulation, body & hip pain relief and support muscle recovery. 14 Massager Knobs: This occipital release tool features 14 firm massage knobs designed to effectively target muscle groups like the psoas, trapezius, lumbar, gluteus, rhomboid, and piriformis syndrome relief. Firm but not Hard Hip Stretcher: Our myofascial release tool is made with flexible silicone, which makes it firm and sturdy. It springs back once pressure is applied, and it can't easily be deformed and broken. Ergonomic Piriformis Stretcher: This hip flexor release tool uses side knobs to target tight muscles while keeping the center knob-free to protect your spine’s natural curve. Your Satisfaction Matters: We stand by the quality of our sciatic nerve release tool back massager. If you're unhappy, you can return it within 30 days of purchase.