Made of BPA free silicone and fits tumblers with regular straws. Why are straw toppers the new, next best thing? - they prevent water or any other fav drink from spilling - stop dust or other debris from entering your cup - most importantly it stops wasps or other bugs from entering through the straw. Please note: this is not a toy and is not recommended for children under 3. Each sold separately. Packaged in a small plastic bag.