Durable rubber construction for long life Made of grade rubber, these two espresso machine blind backflush disks are built to last and maintain their shape through repeated use. Each disk is precisely crafted to create a seal for effective cleaning of your espresso machine. Two sizes included for broad compatibility This set contains two different sized disks 50 mm and 57 mm making them compatible with most standard portafilters. Check your machine's specifications to select the appropriate size for fit. Essential maintenance tool for better performance Regular backflushing helps remove coffee oils that build up in your espresso machine, supporting consistent flavour and extending the lifespan of your valuable equipment. These discs make maintenance simple and effective. Easy to use and effective Simply insert the appropriate sized rubber disc into your portafilter basket, attach to your machine, and run a cleaning cycle. The solid design blocks water flow, creating the pressure needed to flush cleaning solution through the system. Use scenarios Regular daily or weekly maintenance in home or cafe settings to keep flavour consistent and the machine in good condition. Deep cleaning after heavy use or after switching coffee beans or roasts to remove oil buildup. Routine servicing or when replacing portafilter baskets to ensure a proper seal and effective backflushing.