This hand-crafted glass massage tool has been ergonomically designed to help reduce therapist fatigue and joint damage. Replaces the thumb or elbow during deep, therapeutic strokes. Can be heated or cooled for use in “stone” massage applications. Dishwasher safe and nonporous. Can be disinfected and sanitized. 1-year limited warranty. Choose from cobalt blue, ruby red, midnight black, lavender purple and emerald green.