This is a set of 2 silicone caps only for DURALEX Picardie glasses. (Glasses are not included) The vibrant light green caps can also be used as coasters, and are apparently called "Glass cap and Coaster". The material is silicone-like, similar to a Tupperware lid, and it closes tightly. After purchasing, I only used the glasses for daily use, and these caps were hardly used. I threw away the packaging, so I don't know the official model or part number. The glass shown in the photo is for reference only and is not part of the item for sale. The diameter of the lid was approximately 9 cm. The size of the glass shown together is an amateur measurement. (It is not the item for sale. It is for reference.) Rim diameter: 8.5 cm Base diameter: 5 cm Height: 9 cm Capacity: 250 ml DURALEX