West Pharmaceutical Services Inc manufactures components and systems for the healthcare and consumer products industries. The firm operates in two segments: pharmaceutical packaging systems and pharmaceutical delivery systems. The packaging systems segment generates the vast majority of revenue. It sells packaging components and systems for injectable drug delivery, including stoppers, seals, closures, and prefillable syringe components. The delivery systems segment provides systems for drug containment and administration, including multicomponent systems for injectable drug administration and custom manufacturing solutions. West Pharmaceutical Services generates the largest proportion of its revenue in the United States.