The series focuses on Glass and PET Finish Geometry (GME), providing information about the upper part of bottles or jars known as the "neck." It covers specifications for measuring neck finishes, including drawings, definitions, and dimensions for plastic and glass bottles. Various neck finish types, such as PCO, ROPP, MCA, and FEA, are available for download. The importance of these specifications is highlighted for designing molds, ensuring closure functions, compatibility with bottling lines, and serving as a basis for new designs. Special considerations include compatibility with the bottled product, filling conditions, heat treatments, storage, and distribution conditions. The data sheets emphasise collaboration with bottle manufacturers to minimize manufacturing defects.