High quality materials: this blind filter disc is made from premium rubber that is durable, has good elasticity, and is environmentally friendly. It is non-toxic and safe for daily use. Why you need it: designed for backflushing espresso machines. It helps clean oils and coffee grounds from the group head, restores pressure and flavor consistency, and provides reliable maintenance between more thorough cleanings. Compatibility and size: compact and lightweight, designed to fit most standard espresso portafilters. easy to install and clean, making routine maintenance quick. Precautions: use only with espresso machines. choose the correct disc size for your portafilter based on actual equipment needs. Features: small and easy to handle, non-toxic rubber, simple to clean, provides a reliable seal during backwash, compatible with most standard handles and portafilter setups. Use scenarios: - Home barista performing regular backflush to keep your espresso tasting fresh. - Small cafe or office setup doing routine maintenance between pulls. - Traveling with a compact espresso machine to maintain performance on the go.