WJX Cartridge Needles is patent design make the needles run extremely stable and smooth, have the Lowest Tin solder to avoid chemical process to ensure safety. Special Rebound - there is four special elastics that lighten the pressure the needles bar Medical Grade LG PC - made by PC polycarbonate, Polycarbonate is colorless, transparent, heat resistant,impact resistant. Original Design - WJX patent cartridges design achieve better hitting skins performance
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