Original Blue 60g (2.1oz) Tube Bx/12 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 Unique Can't Be Copied Formula Is Hypoallergenic Bacteriostatic Non-sensitizing And Non-irritating No Formaldehyde Not A Spermicide Used And Recommended By Leading Manufacturers Of Medical Ultrasound Equipment Worldwide