Specifically designed for Owala FreeSip: This replacement pack is precision-engineered for the Owala FreeSip range of plastic and stainless steel water bottles. It is fully compatible with the 19oz, 24oz, 32oz, and 40oz stainless steel models, as well as the 25oz Clear Tritan plastic water bottle. Please be sure to check your bottle model before purchasing to ensure a perfect fit. Incredible leak-proof design: Each of our replacement stoppers and seals undergoes careful engineering and extensive testing to provide maximum leak protection. With these accessories, you can ensure your water bottle stays clean and leak-free for a pleasant daily hydration experience. Premium BPA-free silicone: The reliability and durability of our stoppers and seals guarantee optimal performance. Both are hand-washable and dishwasher-safe, ensuring a convenient and hygienic user experience. The package includes all the necessary items: the generous quantity ensures you'll always have a backup in case of an unexpected need or even to share with friends. Compatibility Note: Please note that our product set is exclusively compatible with the Owala FreeSip 19/24/32/40 oz stainless steel thermos bottle and the Owala FreeSip 25 oz clear Tritan plastic water bottle. It is not compatible with water bottles of other brands or sizes. Please confirm your water bottle model before purchasing to avoid disappointment. Material: Silica gel. Color: Gray and white. Package contents: 4 replacement stoppers and 4 washers.