Coffee Dosing Ring stop wasting coffee and messing up your work top  with a coffee dosing funnel all the coffee goes into the portafilter basket, severely reduces the mess and difficulty in loading and tamping. Coffee powder funnel is made of premium 304 stainless steel or aluminum alloy, non-rust nor corrosive, food grade material, safe to your family’s health. You simply place the funnel at top of your portafilter while grinding, and just rinse with water while cleaning.