BioFlex Nose Studs are ideal for initial piercings and piercings taking a long time to heal. The head is a tiny 1.5mm so they make dainty and discrete studs.BioFlex is an excellent piercing material! BioFlex can be steam sterilized or autoclaved; BioFlex is highly bio-compatible. It reduces the chances of an allergic reaction to almost zero. BioFlex highly flexible and bends with the body for ultimate comfort.