Suction Cup Use: Under glass table for anti-slip effect, great for hanging items on windshield, mirrors, windows or any clear glass surface.Glass table spacers material: transparent soft silicone rubber, no blue color, no odor.Easy Installation: Can be installed and removed easily.Wide Usage: Ideal for a multitude of tasks around the home and office.Sizes to choose from: (diameter) 20 mm, Contents: 10 double-sided suction cups.