The World Standard for Medical Ultrasound Transmission, Aquasonic 100 is the most widely used gel for diagnostic and therapeutic medical ultrasound. Recommended for all procedures where a viscous gel is required. - Acoustically correct for the broad range of frequencies used. Completely aqueous, will not stain clothing or damage transducers. Nonsensitizing and nonirritating. No formaldehyde. Paraben free. Tube contains 2 ounces of ultrasound transmission gel.