This dry hopping tube is perfect for home brewers who want to add extra flavor to their beer in a glass carboy. Whether you're a beginner or an experienced brewer, it's a great tool. The tube is made of 400 - micron stainless steel mesh and comes with two removable food - grade plastic stopper caps. There's no need to worry about over - filling, as it's recommended to use no more than 2.5 ozs. of hop pellets or 2 ozs. of coffee beans to avoid swelling inside the tube.