Complete Replacement Kit: Includes 4 bite valves, ideal for backups, sharing, or rotating replacements to maintain cleanliness and performance. Premium & Durable Materials: Our bite valves are made of BPA-free silicone, ensuring friendly for kids and durable for daily use. Perfect Fit & Leak-Proof: Designed specifically for Zak Designs Kelso 15 oz bottles, these valves ensure a snug, leak-free seal. (Please note that our product is not sponsored or endorsed by, or affiliated with the brands it fits, including Zak.) Easy Cleaning & Maintenance: Rinse with water or use brushes (not included) for thorough cleaning. Keep straws fresh after school, sports, or outings with minimal effort. Easy Installation: Simply detach the old valve and snap in the new one-no tools needed. Replacing just the valve instead of the entire bottle! Specification:
Color: as shown in the picture
Material: silicone
Product Size: 5.4x3.7cm/2.13x1.46in

Package details:
4 x replacement bite valve

Note:
Due to manual measurement, the size and weight may have a certain error.
Due to the difference between different monitors, there may be a slight color difference existed.