Our professional knives are made in Sheffield, England featuring fully hardened and tempered stainless steel (420H) blades. Polypropylene co-polymer handles are metal detectable, x-ray visible, food grade and stocked in blue only. Other colors are available, contact Detectapro for minimums. Both the blade and the handle can withstand rigorous sterilizing and dishwasher use and do not present the potential health hazards frequently associated with other knives.