The PS (polystyrene) plastic allows these jars to display your product with crystaline clarity. This 0.25 oz clear PS regular wall jar has a 33-400 continuous thread neck finish. It is straight sided, which in packaging terminology describes the sharp angle between the side wall and the base of the jar. These jars are ideal for Medical, Cosmetic, Pharmaceutical, Automotive, Janitorial, Fine Arts, Craft and Hobby, Confectionery, and Candy and Snack Industries.