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They are 12-pin cartridges with 0.25mm diameter and are available in 4 sizes: 0.25mm depth 0.50mm depth 1.0mm depth 0.15mm depts (Nano)
Sterilize the cartridge in 75% alcohol. Assemble the cartridge and retainer ring to Hydra Pen. Press the power button for 2-3 seconds to turn on the pen. Click again to adjust the speed from 1 to 4.
Using slight pressure, move the pen back and forth on cleansed, dry skin 4-5 times.
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