Heavy Duty Adhesive Pads – Original 3M stick adhesive pads, double sided self-stick black adhesive pads, stronger than most adhesive pads. Can be used to install large and heavy tools on car paint, plastic, glass, wood, metal, and ceramic tiles and other smooth surfaces. Multipurpose Black 3M Pads – 20 pcs 4 cm x 4 cm squares, 20 pcs 4 cm diameter rounds, and 20 pcs 3 cm x 5 cm rectangle pads. All pads are 3 mm thick, ideal for wall hanging, carpet, car, home, and office decor. Easy to Install – 1. Clean the surface. 2. Remove the adhesive liner. 3. Use a blower to remove dust from the surface. 4. Position and press firmly for 10 seconds to achieve optimal adhesion. Strong and Durable 3M Adhesive – The 3M backing provides maximum stickiness – reaches full bond strength in 72 hours. Overlapping application does not affect performance. Can be used to replace rivets, screws, spot welds, and messy liquid adhesives. Notes: 1 – Do not apply 3M adhesive pads on very soft, rough, textured, greasy, or leather surfaces. 2 – Ensure the surface is clean and dry before application. 3 – 3M adhesive pads are for one-time use only. 4 – Wait at least 24 hours before loading to ensure maximum bond strength.