Made of high quality environmental friendly polyvinyl chloride, 20mm diameter. They are transparent, durable and reusable. | These small suction cups are not easily affected by hot or cold temperatures. They are not easy to age and enough to protect your items. | Due to made of environmentally friendly new materials, they are perfect for car, kitchen, desk, fish aquarium, car window glasss etc. | They are multi-purpose and suitable for hanging holiday decorations, organization projects, handmade crafts, small and light weight stuffs. | More functions are waiting for you to discover and your satisfaction is our sincere pursuit.