The seedling heat mats made by Jaye has two heating element types, one is the Carbon film heating element and another is the heating wires as the heating element. Heating wire as the heating elements inside is the most common and popular type of seedling heat mat, In order to get a higher heating and energy affect, Jaye developed the carbon film heating element seedling heat mats, compared with the heating wires, the film type heater can provide more Uniform heat. faster heating, longer service life. Jaye custom makes seedling heat mats based on customers specific requirements. we can also inbuilt thermostat or additional thermostat to have better temperature controls as per your requirements!