This is a 50ml Child Resistant LDPE Boston Round and has a 13-415 neck finish. A classic bottle shape in the packaging industry, the Boston Round Bottle can hold almost any liquid or solid. Traditionally used for pharmaceutical, chemical and laboratory applications, popular uses break the mold and extend across most markets today. These easy squeeze LDPE bottles are flame treated, which helps when decorating bottles. These bottles are sold by the case (100 count).