These hooks come as a 4 pack and use a suction system to attach to smooth nonporous surfaces without drilling, screws, glue, or permanent fasteners. The suction pad is made from ABS plastic with a rubber component that helps create a seal on clean surfaces and can support up to eleven pounds when properly engaged. Installation relies on a simple lever action; push the lever to lock the hook in place and pull to release it for removal or repositioning. The design is intended to be removable and reusable, allowing you to adjust your setup as needed without leaving holes or sticky residue. For best results, apply the hooks to polished ceramic tile, glass, mirror, polished stainless steel, or similar smooth materials, and avoid porous, textured, or rough surfaces where suction will be weaker. If a suction pad loses its grip, rinse the rim and surface with water, dry both thoroughly, and reapply after warming the rubber slightly with a hair dryer to restore elasticity. Clean surfaces and a dry environment improve suction longevity; keep surfaces free of dust and oils before applying. This product is packaged as 4 hooks intended for temporary, reversible mounting in bathrooms, kitchens, and other living spaces. Color: Black.