This glass cleaning brush is made of PP PVC material, flexible bristles, moderate hardness to ensure remove stubborn dirt and longer life. There is three big suction cups at the brush bottom. Its firmly attaches to the wall table or or attaches to the bottom of sink,  just slide glassware between the two sets of bristles, convenient to use and cleaning. This creative lazy rotating cup brush can be removed and cleaned，easy to drain, clean and hygienic. Just make sure you rotate cups clockwise on center brush as going counter clockwise will unscrew the center brush. It is thick and can clean all kinds of glassware, such as baby bottle, sports bottles, wine cups,coffee cups, beer players, vases or coffee pots, pitchers. Perfect cleaning tools for bar kitchen.