Twin Pack: Each purchase includes a twin pack of replacement straw tops, allowing you to replace both the top and bottom sections of the straw. Compatibility: These replacement straw tops are specifically designed to fit the 450ml and 600ml B.Box Tritan drink bottles. Made from Silicone: The straw tops are made from silicone, ensuring durability and flexibility. Silicone is also known for its safety and non-toxic properties. Spill-Proof Design: The new straw tops feature a spill-proof design, helping to prevent leaks and spills while on the go. Easy Drink Straw: The replacement straw tops are designed with an easy drink straw, offering a simple and easy sucking action for convenient hydration throughout the day. Environmental Impact: The straw tops are now sold separately to minimize unnecessary spare parts and reduce environmental impact, reflecting a commitment to sustainability. Overall, the B.Box Tritan Drink Bottle Replacement Straw Tops offer a practical solution for maintaining and extending the lifespan of B.Box Tritan drink bottles, ensuring continued usability and convenience for users while also promoting environmental sustainability.