Designed for diagnostic and therapeutic medical ultrasound-Ideal for procedures requiring a viscous or non-spermicidal gel-Grafco Gels are hypoallergenic and completely aqueous formulation, non-greasy-Grafco Gels will not stain clothing or damage the transducers-Easy to apply and remove-Salt-Free and Formaldehyde Free formula eliminates air between transducer and skin, offering exceptional coupling efficiency for more effective treatment and diagnosis-For External Use Only 5 Liter Gel comes with one (1) empty 8 oz. bottle