. Easy to clean. Safe and non-toxic. Designed for use with coffee machines. Condition: Item Type: Blind Filter Weight: Approx. 7g / 0.2oz per piece Each blind filter and coffee machine portafilter come with a built-in strainer. Insert the blind filter into the portafilter of the coffee machine, then add one scoop (3 to 5g) of coffee machine cleaning powder or a cleaning tablet. Press the brew button, run for about 10 seconds, then turn off. Repeat this process 5 to 6 times with 10-second intervals. Remove the blind filter, rinse the portafilter thoroughly, and the cleaning process is complete. Color: Black Material: Rubber Size: 5cm x 5cm x 0.2cm Package Contents: 4 x Blind Filter Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement error is +/- 1-3cm.