Features: - The Flat Ovular Basalt Stones are the most popular choice of stones used by therapists as not only do they retain heat due to their high polished finish, but they are also the most comfortable and convenient shaped stone to use. - It's designed for treatments on the backside, stomach, arm, thigh, calf and back of the neck. - All Basalt is rich with iron and magnesium, which make this stone very effec tive in massage treatments. - To warm the body before a massage, heating them to 130 DegreeF/55℃ to warm areas such as the stomach and haunch and use it as a warm neck pillow. - The rounded, narrower edges can also be used to pressurize and knead particularly tense muscles and areas during treatments. - 100% Natural Black Basalt; Excellent for holding heat for long periods of time; Rich with iron and magnesium. - Shaped and polished by traditional handcraft, no wax, dyestuff, chemicals were applied. - Basalt is excellent for holding heat for long periods of time and has very low radiation which makes this rock a much more healthy and beneficial stone for use. Specifications: Material: Basalt. Weight: 1.5kg. Color: Black. Stone Size: 85 x 60 x 20mm. Package Includes: 8 x Flat Ovular Basalt Stones. Notes: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight deviation for the measurement data.