The extrusion process allows you to make design changes around function and appearance. One popular option is adding customized colors to tubing. You can achieve this either by adding a pigment into the raw resin or adding a special coating. Another design option is making tubing out of more than one material. For example, mixing nylon with polyethylene increases tensile strength and flexibility. Likewise, customized extrusion can also involve adding fireproof additives to plastics. Adapting tubing for specific applications is popular, especially for medical devices or machinery. As well as the fire-retardant additives, extrusion can include reflective materials for visibility. Thus, it is ideal for use in emergency services.