- With suction cups that grip smooth surfaces.Maximum load/hook: 3 kgPackage quantity: 4 packKnob/ Cover: ABS plasticSuction cups: Synthetic rubberInsert/ Insert nut: ZincOnly sticks on smooth flat surfaces such as glass, mirrors and tiles.Clean your tiles before mounting the suction cup to ensure better grip.Rinse the suction cup under running water and let air-dry before use.After assembly, leave the product on the wall for 12 hours before using it. This helps the suction cup to adhere better.For increased stability, make sure to retighten the screws every 3 months.Each hook holds up to 3 kg.