73 mm x 57 mm x 8 mm (Red) , the standard 8 mm thick gasket for E61 group heads. The Cafelat and "E61 8" side faces up when installing.

Some product history and notes:

• The reason silicone was chosen as the material is purely from a cleanliness point of view, the gaskets are neutral and do not have any smell or taste  
• They do not bake hard so removal is easier
• No need to crank the portafilter tight in the machine as you would a hard EPDM, NBR or HNBR rubber (the industry standards) gasket
• Always use a such as food safe white grease. Silicone does not like petroleum based grease 
• When installing do not use a sharp screwdriver to push them in, the silicone will break. Use the portafilter with the basket removed to install  
• All batches are tested, the manufacture use FDA approved silicone and have them independently in Hong Kong