These 457mm (18 Inch) straws come in two varieties: flexible and rigid. The 3mm (1/8 Inch) and 6mm (1/4 Inch) diameter, rigid straws can be heated with a heat gun and reshaped as desired. The larger rigid straw is ideal for soups. The flexible polyethylene straw comes with a 5mm (3/16 Inch) diameter hole.