• Made from natural basalt, these massage stones contain beneficial minerals for the body and offer excellent heat retention. • The set includes: 2 round stones (8 x 8 cm), 2 large stones (7 x 9 cm), 2 medium stones (6 x 8 cm), and 8 small stones (3 x 4 cm). • Ideal for relieving stress and fatigue, they combine vegetable oils, therapeutic massage, and energy therapy to improve sleep and increase energy. • It is recommended to use with essential oils for best results. Heating time: 20-30 minutes at approximately 60 ℃. Cool for 2 minutes before use. • Easy to clean: rinse with warm water after use and dry well. • Perfect for home use or as a gift for birthdays, holidays, or anniversaries.