Using Metal Detectable Products in your facility is a great way to ensure the product that you ship out does not contain foreign materials. Metal Detectable Products are products that can be detected by a metal detector. In plastic products, such as pens, a metallic pigment is added to the resin during the manufacturing process, and it is this pigment that is actually detected by the metal detector. Other products, earplugs for example, contain a stainless steel ball bearing, which is then detected by the metal detector.