West Pharmaceutical Services makes packaging components and delivery systems used in injectable drugs, including specialized rubber stoppers, seals and prefilled syringe components that pharmaceutical companies need to package and administer injectable medications safely. Its components are used heavily in the packaging of vaccines, biologics and other injectable drugs, where the quality and integrity of the packaging is critical to maintaining drug safety and effectiveness throughout storage and administration. West Pharmaceutical benefits from the broader growth in biologic and injectable drug treatments, since these complex medications typically require more specialized packaging and delivery components than traditional oral pills. The company's revenue is tied to overall injectable drug manufacturing volumes and the ongoing shift in the pharmaceutical industry toward more complex biologic treatments that require its specialized packaging expertise.