Pfaff Magnetic Seam Guide
This magnetic seam guide from Pfaff gives accurate seam allowencres and straight lines. This is made from plastic, not metal so it will not scratch your sewing machine. It has a finger lip to lift the guide to wherever you want.
It snaps onto the needle plate on either side of your presser foot - the longer edge gives a more accurate and parallel seam.
This is a genuine Pfaff product.