WeeSprout Set of 4 Glass Drinking Jars is a perfect solution for your baby feeding needs. These 12 oz jars are leakproof and come with lids for easy storage. The multicolor jars are perfect for your little one's favorite drinks. The brand is WeeSprout, known for their high-quality baby feeding products. These jars are made of glass, silicone, and plastic. The silicone casing insulates the jars. This set of four jars has two lids for each jar. One has a hole for use with the straws that are included and the other lid is a leakproof lid for Storage and travel. It also comes with a straw cleaner for much more precise cleaning of the straws.