For many years only high-quality far infrared saunas dominated the infrared sauna market. Craftsmanship, for the most part, was very high. Woods used were Western Red Canadian Cedar and quality white woods such as Basswood, Spruce, and Aspen. The majority of infrared heaters produced used ceramic and metal, with ceramic being the preferred type because of higher infrared efficiency and infrared output. There were rigid quality control standards for the woods, glues, and electrical safety used. As options over the internet have expanded, low-quality overseas manufacturing spawned numerous upstart sauna companies with little to no understanding of the therapeutic benefits of infrared therapy. They were selling a wooden box with heaters, offering low cost and in turn low-quality saunas on the internet and at big box stores.