There are 4 small suction cups at the bottom of the cup brush,which are easy to be adsorbed on smooth surfaces such as ceramic,glass,stainless steel and marble.it 't move easily and work better Simply insert the glass into the brush and rotate the glass for quick cleaning.And three brushes are detachable,very convenient The brush is made of high quality plastic material and nylon bristles,safe and non-,the brushes are strong and spaced well for both sides of a bar glass cleaned You saves time on those glasses and get sparkly clean,Perfect for bar counters,restaurant kitchens and homes Suitable for red wine glasses,drinking glasses,cocktail glasses