The Ideal Seam guide is thick enough to provide a fence for your fabric as you guide it to the needle. You can re-position the Ideal Seam Guide hundreds of times! When the Ideal Seam Guide loses its grip, gently wash it with a multi-surface cleaner, rinse it and let it air dry. The Ideal Seam guide regains its grip again and again! 15 inches of STRAIGHT with a notch on one side to work with wide feed dogs or a walking foot - No Clamps! - No Magnets! - No Suction cups! - No Sticky Residue! - Fabric will not slide under! - Rubber Holds in Place! - Releases with the slightest upward pressure on beveled end! - Clean with multi-surface cleaner then rinse with warm water when 'Linty'! Let air dry!