Thank You Structured Silver Gel: 3 Cylinders (save $19.90)Each contamination proof container holds 56 ml (2 fluid ounces) of Thank You Silver gel. It is ideal for helping restore healthy skin! The gel features 25 ppm (parts per million) structured silver gel and is ideal for topical application. Thrifty Tip: Since the cost of shipping 3 or 6 gels is very similar, you can reduce your cost of shipping per gel quite a bit by ordering a 6 pack. Silver Gel Thank You Silver Contents Silver concentration: 25 ppm 56