Description:Keep the temperature for 20 minutes: The cold gel technology allows the roller to keep the temperature for up to 20 minutes. Hot compress and cold compress: For hot compress, immerse the stainless steel roller in water at 50~70 degrees Celsius for more than 5 minutes, and for cold compress, put the roller in the refrigerator for more than 2 hours. Smooth rolling: The stainless steel massage rollers have bearings that are easy to slide to achieve smooth rolling. Relieve muscle soreness: reduce inflammation, relieve muscle soreness, and relieve pain faster. Portable: The stainless steel drum can be kept cold for a long time, and the non-refrigerated alcohol-based liquid is used, which is very convenient and portable Product Description Keep the temperature for 20 minutes: The cold gel technology allows the roller to keep the temperature for up to 20 minutes. Hot and cold use: During hyperthermia, immerse the stainless steel roller in water at 50~70 degrees Celsius for about 5 minutes+. When used in cold, place the roller in the refrigerator for more than 2 hours. EASY-GLIDE Smooth rolling: The stainless steel massage roller has an easy-to-slide bearing to achieve smooth rolling. Relieve muscle soreness: reduce inflammation, relieve muscle soreness, and relieve pain faster. Portable: The stainless steel drum can be kept cold for a long time, and it uses non-refrigerated alcohol-based liquid, which is very convenient and portable