dr. cohen's heatable acuball, heatable relief of arthritis, back, neck, hip, shoulder, buttock,leg, chest pain and so much more by acu-system acu-system heatable, deep tissue ball provides effective pain relief anytime;uses 100 percent natural acupressure and heat to release tight muscles and joints;microwave for one minute to receive 60 minutes of soothing heat;relief for pain/tightness in neck, shoulders, back, leg, hips and feet;diameter - 3.5 inch;dr. oz featured the acuball on his show calling it an alternative health must-have for back and neck pain;relieves muscle and joint pain naturally using clinically proven accupressure and heat;empowers users to help themselves saving time and money;includes acuball therapy booklet