Intend to be used for the temporary relief of minor muscle and joint pain and stiffness; for the temporary relief of joint pain associated with arthritis; for the temporary relief of muscle spasms, minor sprains and strains, and minor muscular back pain; for the relaxation of muscles; and for the temporary increase of local circulation where applied. May be used on a bed, on a table or on the floor. Materials: High-quality, nontoxic medical-grade leather with natural semiprecious stones: tourmaline, amethyst, jade, obsidian, and quartz. Gemstones heat up to 160° F (70° C). Wellness Enhancing PEMF with changeable: -Waveform (Sine, Square) -Frequency (1 to 25Hz with 7.83 Hz default) -Pulse duration (medium, fast, ultra fast) -Intensity (10% to 100% Settings) -Time (20 min, 1 Hr). Far Infrared rays wavelength range is 5-14 μm. 30 Rejuvenating Photon Lights, 660 nm. Calming Negative Ion Therapy, up to 3000/cc. Size (approx.): 32" x 20" x 1.5" (80 cm x 50 cm x 4 cm). Weight (approx.): 8.5 lbs (4 kg). Amethyst: 2.8 lbs. Tourmaline: 0.2 lbs. Obsidian: 0.1 lbs. Jade: 0.1 lbs. Quartz: 0.12 lbs.