Heavy Duty Adhesive Pads Original 3M adhesive pads, double-sided self-adhesive black pads, stronger than most standard adhesive pads. Suitable for mounting large and heavy items on smooth surfaces including painted car surfaces, plastic, glass, wood, metal, and ceramic tiles. Multipurpose Black 3M Pads Includes 20 square pads (4 cm x 4 cm), 20 round pads (4 cm diameter), and 20 rectangular pads (3 cm x 5 cm). All pads are 3 mm thick, ideal for wall mounting, carpet securing, automotive use, and home or office decor. Easy to Install 1. Clean the surface thoroughly. 2. Remove the protective liner from the pad. 3. Press the pad firmly onto the surface for 10 seconds. 4. Allow 24 hours for full bond development before applying load. Strong and Durable 3M Adhesive High-performance 3M adhesive achieves maximum bond strength within 72 hours. Designed to replace mechanical fasteners such as rivets, screws, spot welds, and liquid adhesives. Notes: 1. Do not apply to soft, rough, textured, greasy, or leather surfaces. 2. Ensure the surface is clean, dry, and free of dust or oil before application. 3. These adhesive pads are for single-use only. 4. For optimal performance, allow at least 24 hours after application before subjecting the bond to stress.