Bring the spa experience home with this basalt hot stone massage set. This 20-piece set comes with four extra large stones (6 x 8 cm), four large stones (6 x 6 cm), and four medium stones (5 x 6 cm), and eight small stones (3 x 4 cm). This can be ordered either with or without the heater bag. Simply add the stones to the heater bag and plug into a standard outlet for 5-10 minutes. Unplug once the stones are heated. Be sure to order our Soytopia Massage and Body Oil for the ultimate relaxation spa experience.