Available for 20oz & 30oz tumbler. Coaster's Dimension:Diameter:70 mm;Height: 18mm. Extension Range: 69.5mm~76.5mm Avoid unwanted scratches, dings, or dents with this extra layer of protection during outdoor or indoor adventures. With its silicone construction, the boot is completely BPA-Free with no hazardous chemicals. Safe for all ages. High quality, Eco-friendly and Durable, Waterproof. Prevent the bottom base of your new tumbler from dings, dents and getting scratched. Made of flexible silicon. Protect the paint of bottom base. Package Include: 4 x silicone coasters.