No glue needed with these super strong Neodymium Disc Magnets with Adhesive. Just peel off the adhesive liner and stick to your craft or project. Industrial-strength acrylic foam adhesive conforms to the irregularities of rigid substrates and adheres the magnet to a multitude of materials including wood, plastic, ceramic, rock, paper and much more. Use for practically any light, medium or heavy-duty project, where super strong pull force is required. Due to the extreme strength, these magnets are NOT FOR CHILDREN, because they can pinch fingers.