AQUAGOLD® fine touch delivers low doses of injectable drugs at a consistent depth and is almost pain-free. This is a major advantage over the conventional syringe manual injection approach for certain sensitive areas, preventing overdosing or getting the needles too deep into the skin. The surgical grade stainless steel provides the structural integrity of the microchannel. Pure gold has high biocompatibility with human skin, preventing skin irritation and allergic responses after use. Impurities and other metals may result in unnecessary irritation. The microchannels are 600 micrometers (0.6 mm) long and 130 micrometers (0.13 mm) wide, each thinner than a human hair.