These 4 oz boston round bottles are made from high quality PET plastic, which is a durable and lightweight material. They are perfect for packaging a variety of products, including cosmetics, personal care items, food and beverage products, and more. The clear design allows for easy product visibility, while the 20/410 neck finish provides a secure and leak-proof seal. The bottles are also compatible with most standard bottle caps and closures, making them easy to fill, seal, and label. With a capacity of 4 ounces, they are the perfect size for smaller products or samples. Whether you're looking for a reliable and affordable packaging solution for your business or personal use, these PET plastic boston round bottles are a great choice.