If you are unsure whether your model fits the matrices, please write us a message, preferably with a photo of your pasta machine. We will answer you promptly and say which matrices will fit with you. POM is the abbreviation for polyoxymethylene, a guaranteed food -real plastic. It is exactly the same material that the Philips Pastamaker matrices are also used. Please note that the matrices are manufactured with micropolas. This is an elaborate procedure that enables filigree shapes. But small scratches from production and smaller chips can be present, these are inevitable when using POM. It happens again and again that there are switching that switch from the tube noise to the Philips pastamaker Avance. In this case we have good news. You can continue to use these screen and the other KA-m.