Roll-on-pilfer-proof

One reason why metal closures (mainly roll-on pilfer-proof, ROPP) are used on glass is because the dimensional tolerances of glass are such that it is vital to form each closure to fit each individual bottle neck (the ultimate form of customisation) and this can be done with ductile metal. In recent years, the use of plastic closures on glass bottle has grown. Consumers usually find the tactile properties, ease of grip and safety (from metal edges) of plastic closures superior to ROPP metal caps. 

Metal roll-on or roll-on pilfer-proof closures... 

---