【20 Pieces Hot Stone Massage Set】The package contains 4 round stones (8 x 8 cm/ 3.14 x 3.14 inches), 4 oval stones (8 x 6 cm/ 3.14 x 2.36 inches), 4 oval stones (6 x 5 cm/ 2.36 x 1.96 inches) 8 small stones (4 x 3 cm/ 1.57 x 1.18 inches), with 1 heating box, different sizes can meet your different body massage needs - neck, back, shoulders, arms and legs, etc, Basalt Massage Stones with high silica and iron content and retain heat longer than most stones, After heating, please be sure to wrap it in a towel before taking it out to avoid burns, and it is recommended to boil it directly for disinfection when using it for first use 【 Easy to Use】The hot rocks massage stones kit are easy, simply place the hot stones for massage on the liner of the heater case, connect the power plug and heat the stones for 20-30 minutes, massage rocks case heats up to around 122-158°F, use these massage stones with essential oils for better effect, be careful not to put these hot stones on the skin immed...