Cartridge are available in 2 lengths 0.5mm, 1mm. Use: The cartridge is placed in the Hydra Pen, when the needles/cartridge works on the skin up and down, the serum penetrates from the applicator automatically and pushes the serum into the skin. The needle’s length determines the depth the serum is infused into the skin. Includes: Needles: 12p (12 needles in a cartridge) Material: Container plastic, needles stainless steel Packed: Individually in a pre-sterile package Disposable use: Each cartridge is for one time use only
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