Nirlon Non-Stick Aluminium Mini Cookware Set (Tawa, Fry Pan, Kadhai), Red Nirlon Non-Stick Coating is applied after proper chemical cleaning and sand-blasting of the surface so that the non-stick holds the surface of the metal properly. The quality of this coating is top-grade, free from harmful chemicals like PFOA or any heavy metals. This coating is applied evenly, to sufficient thickness so that even with rough and constant use, the metal surface is not exposed. Coating applied via this robotic spraying is much better than the one tuck to the pan by a roller, and lasts longer.