"Dynarex Ultrasound Gel is acoustically correct for a wide range of frequencies used in ultrasonic echo imaging systems and will not damage transducers. The Ultrasound Gel is bacteriostatic, non-staining, non-irritating, non-greasy and fragrance free. Available in blue or clear and sold in 1.3 gallon collapsible jugs or refillable 8.5 ounce bottles for easy dispensing.