This seam guide has a rubberized adhesive on the back that allows you to reposition it over and over again. You can clean it if it gets too dirty. The notch allows you to work with a regular foot or a walking foot.
This is a great video from Sparrow Quilt Co. on how to use this guide. https://youtu.be/oBr7gJEG1Ks
Sew Very Smooth Ideal Seam Guide
$22.00Price