These silicone straws are designed as reusable drinking straws that fit common larger tumblers, including 30oz and 40oz sizes. The set supports customizable length to match various cup heights and features a wrinkle-free design for smoother sipping. Each set includes cleaning brushes to help keep the straws clean after use. Available in several color options such as Summer Colors, Vintage Colors, Macaron Colors and Gradient pink, these silicone straws offer a simple, reusable alternative for people who use insulated or tall tumblers. According to the provided product information, they are not listed under CA Prop 65 for carcinogens or reproductive chemicals.