The Mettler 18 x 26 cm Cloth Cover for Soft-Rubber Applicators (#3967) is designed for use with the Mettler 390 Shortwave Diathermy. The washable, reusable cloth cover goes over the pads of an applicator to keep the machine clean. This lets you easily use the 390 Shortwave Diathermy for several patients without worrying about cross-contamination.