This is the thickest version. This is the preferred version in Europe. It allows for the use of taller (triple) baskets, while still only using 14 grams of coffee. There is a 3 mm as well as a 4 mm thick version available.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.