Use SewTites® Booster magnets with the Sew Magnetic™ Mat (found here) and Ruler (found here) of your choice to:
strengthen the hold of your ruler when cutting ultra-thick materials and fabrics
hold down paper pattern pieces without pins
hold down acrylic templates without pins
 
Please note: Boosters will not hold to a regular self-healing cutting mat. You also need a Sew Magnetic Cutting Mat (sold separately).