All of our Round tube inserts are made using a strong, durable LDPE plastic to ensure stability and longevity no matter what the application. These ribbed inserts are an ideal finishing product for open tube ends as they can provide a clean, functional finish that is resistant to many common factors such as acids, alkali, heat and dirt. Each of our Round inserts has been designed with easy fitting in mind and comes with ribs on the exterior of each insert which helps hold it in tightly throughout its use.