Material: hook using the original German rubber TRU + PU, reusable and more stable than similar products. pu is a relatively soft rubber, can automatically fill within 1mm rough surface. Appearance structure: The appearance of the suction cup hook is made of abs, surface plating material. Long service life. Waterproof, moisture-proof and anti-smoke. Easy to Install: Just lift, push in and lock. No screws, no nails, no glue, no tools required. This suction cup with hooks is easy to organize and store in apartments, school dormitories, and offices. Heavy Duty Suction Cups: Made of high quality ABS plastic and German TUP rubber, the suction cups can withstand a maximum load of 11 lbs. and maintain suction for years. Note: Only suitable for any non-porous and smooth surface. Cannot be maintained on porous or rough surfaces. Wood, marble, fiberglass, painted walls, porcelain, nanotile, plaster and wood, or through grout lines., Weight: 6.172943336E-4 pounds, Manufacturer: N-S