Profile: Gemini / Sierra Plastics is a manufacturer of plastic and metal products. We are an ISO 14001:2004 certified company. Our product line includes automotive seats, stiffeners, profile extrusions, extruded seals, silicon tape, foam tape, hollow profiles, locking & overlap closures, extruded plastic channels, protectors, shape maintainers, bumpers and guards. We offer services such as prototyping, supply chain management, production tooling & fixtures, and program management/APQP.