Product Description This listing is for the ARO® Silicone Bellows only. The single dose hopper is not included. To purchase a single dose hopper, see our available listings here. The bellows is made from 100% food-grade silicone and features a smooth matte black finish that resists dust buildup. Designed for high-volume airflow, it effectively purges your grinder of retained grounds offering tens of thousands of pumps without wear. Plus, it doubles as a convenient dosing cup, making it easy to measure and weigh your beans! Compatibility This bellow is compatible with all ARO Espresso single dose hoppers. When used as a dosing cup, it can hold a maximum of around 45 grams of beans. The outer diameter of the bellows at the hopper interface is 63mm. What's in the Box? Silicone Bellows Care and Maintenance For daily maintenance, simply brush, blow, or rinse off any loose grounds and/or wipe clean with a cloth. For a more thorough clean, hand wash with warm water and soap. Be sure to rinse well, and dry. Not dishwasher safe.