Dual-viscosity formula allows Scan to be applied as a gel and scan as a fluid where a less viscous gel is desired. Will not stain, irritate skin or damage equipment. Hypoallergenic and bacteriostatic. No formaldehyde. Acoustically correct, provides superior transmission of ultrasound waves.- Ultrasound Gel, SCANPAC Contains 4 Gallons, 2 Dispensers, 1 Pump, 1/cs (091023) Mfr. Direct