Go with the MPS brand. It is the one i purchased from Dr. Hildegard Staninger who is an expert in this field. It is the only brand she recommends to her patients. It has carbon fiber heating and no metal or ceramic in the framework. She specifically tested this brand to make sure it was the correct wavelength. I would not purchase far infrared equipment that has not been tested by a reputable scientist like dr. staninger. She's an expert at far infrared and a brilliant scientist who has won numerous awards for her achievements. The MPS company i purchased from offers free "gifts" and specials. Contact them and find out if they have any current specials.