OUR HOT STONES: 6 placement massage stones (around 2.4 x 2.4 in). Basalt massage stone is suitable for full body massage, it heats up quickly & is easy to clean and maintain. GOOD DE-STRESS: This stone has excellent heat retention, the smooth can keep more heat energy & warm your muscles, relieving muscle tension & improving blood flow, making it easier to sleep. KEEP BEAUTY: Use these massage stones with essential oils for better effect. Be careful not to place hot stone on your skin immediately after heating, you can wrap it in a towel to avoid . WIDELY APPLICABLE: These hot massage stones can be used professionally or . Hot rocks massage stones are also ideal for athletes, home spa care, and therapeutic spa centers. WE PROMISE: As these are natural lava rocks, slight variations in size, color & texture are inevitable. Medium-size buys with caution. Color: Black Material: Stone Package Contents: 6 x Massage Stones Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.