CRL Plastic Double Pad Vacuum Lifter have high quality rubber pads that will adhere to any smooth non-porous surface. Pads measure 4-1/2" (114 mm) in diameter, and develop a strong vacuum for maximum lifting power. Individual lift tabs create suction when pulled down. To release you merely lift the tab upright. High strength body is made of a combination of synthetic materials.Most shipping weights are approximate and have not been verified. If the exact weight is needed in order to determine shipping costs, and shipping costs are required in order for you to complete your order, please request this prior to submitting your order by contacting CRL Customer Service. Product images shown are of the actual product or a close representation. Colors can vary depending on your computer's video card and on how your monitor's color is adjusted.