This 25 fl oz clear PET round Single Wall Jar features an 89-400 neck finish and is straight-sided. It also has a straight base, which in packaging terminology describes the sharp angle between the sidewall and the base of the jar. The polyethylene terephthalate PET resin offers excellent clarity and product visibility. The resin also offers a wide range of product compatibility, a good moisture barrier, a good oxygen barrier, and a good fragrance barrier. If the jar is going to be screen decorated, no pre-treatment is needed. An excellent choice for a wide range of products!