www.massagewarehouse.com Kewler 4.5" Thermalball Mega, Blue Thermalball products enhance therapeutic massage by incorporating heat or cold in addition to conventional techniques. It is the ultimate ice therapy product with the easiest and deepest heat therapy available. From freezer or microwave, make pain relief a ball! The unique thermal fluid holds its temperature while Thermalball’s special viscosity improves massage effects on the body or injured muscle. The special covering of the Thermalball is "tacky" to improve contact with the skin and conform to the underlying muscle structure, increasing the therapeutic effect relative to the pressure applied. Hot stones can injure your client and also cool down too quickly to be effective. They are also painful while traversing over bony prominences. Thermalballs are ergonomic for the therapist, provide lasting temperature and a rejuvenating acupressure heated massage experience.