Ranging in size from 1/4 to 16 oz, the white polypropylene jars come with white polypropylene unlined caps. The plastic caps are ribbed on the sides and smooth on top, the ribs offer a better grip when opening and closing the containers. Try using multiple sizes for containing an entire line of suitable dry products such as powders, glitters, gels, plastics, and capsules. See Addons for available shrink bands.