A perfect balance of form and function, SERENE Synergy Stone provides broad warmth with a large flat surface area, notches on both sides for maneuverability and narrow edges for sculpting ability where you need it. Seemingly simple and straightforward, SERENE is more than meets the eye. It's ability to twist and turn from broad and forgiving to narrow and aggressive gives SERENE an advantage over any other shaped stone. Silky Smooth, SERENE "Ultra-Smooth" has an glossy surface that enables you to massage over clothes, friction free, without oil or against the skin with or without oil.
The 1st two below are the "Original" for better grip with oil against the skin.