Sterex Insulated TwoPiece Needles 50 box F5I IGORA Vibrance Best paired with keratin bonds k tip 1 TE201012 Best paired with keratin bonds k tip (for those with thicker hair) and weft extensions Depending on the service provided by your professional hairdresser total service time may vary Manufactured from medical grade stainless steel and coated with a specialist medical grade insulation materialSuitable for sensitive skin typesONLY used for short wave Diathermy and Suitable for Flash ThermolysisSuitable for use on Afro Caribbean or Asian skins (This is because darker skins are more prone to hyper pigmentation and insulated needles only release the current from the tip of the needle causing less damage to the skin)