Holiday Joy - WORLD'S STRONGEST All Purpose 1 3/4" Suction Cups with Hooks - Made in USA (6 Medium) Pack of 6 medium suction cups with hooks. Actual suction cup size - 1 3/4". Each cup is rated to hold up to 3lbs. Great for hanging wreaths and larger decorations in windows, on mirrors, or any other clean, slick, non-porous surface. Once applied, not affected by heat or cold. Strong, rustproof metal hooks. Suction cups do not yellow, deteriorate, or lose adhesion over time. These suction cups have light diffusing rings that prevent focused light from damaging interiors, while the superior material resists yellowing. The metal "U" hook design, is deep and ideal for window-mounted holiday ornaments, stained glass, and decorations. You can use it in the home, office, bathroom, garage and anywhere else you can think of. Often imitated but never duplicated, no other suction cup on the planet delivers the holding power, crystal-clear clarity, unsurpassed safety or value of these "Made in USA" Suction Cups. Over thirty years of extensive R&D has gone into perfecting these cups. Why put your trust in cheap, flimsy and inferior overseas knock-offs that won't hold up and will only let you down. Instructions: Make sure surface is clean. Use only on slick, smooth surfaces such as glass, metal, ceramic tile, plastic, formica, etc. Always test a suction cup before hanging heavier objects or valuable items. For best results, surface should be above 40 degrees fahrenheit when applied.