High quality, easy to clean, and safe for use with coffee machines. Condition: New Item Type: Blind Filter Weight: 7g / 0.2oz per piece Each pack includes a blind filter pad and fits standard coffee machine handles with a strainer. To use, insert the blind filter into the portafilter tip, then add one spoonful (3-5g) of coffee machine cleaning powder or a cleaning tablet. Press the brew button and run for approximately 10 seconds, then turn off. Repeat this process 5 to 6 times with 10-second intervals. After completion, remove the blind filter, rinse the portafilter thoroughly, and the cleaning cycle is finished. Color: Black Material: Rubber Size: 5cm x 5cm x 0.2cm Package Contents: 4 x Blind Filters Note: The package includes only the items listed above; other accessories are not included. Due to lighting and display differences, the actual color may vary slightly from the image. Measurement allows an error of +/- 1-3cm.