Nanogen’s Keratin Hair Fibres are the perfect way to add volume and thickness to your hair in just 30 seconds. 100% natural keratin hair fibres for men and women who want to instantly improve the appearance of their hair. Nanogen's revolutionary hair thickening fibres are made from high quality, 100% natural keratin; a fibrous protein found in hair strands. They merge perfectly with your own hair using electrostatic charge to give instant, natural and durable hair thickness which lasts all day. Kinetic charged fibres maximise the hair thickening effect. Plus they bind up to 400% stronger than others. Look for the metal strip.