Compatibility: Compatible with Zak Kelso 15 oz kids tumblers, ensuring a secure, leak-resistant seal and easy sipping. Fits 15 oz stainless steel and plastic cup versions. Spill-Resistant: Our silicone tip prevents spills, letting children enjoy beverages without messy leaks, even on-the-go. Durable Materials: Crafted from sturdy, BPA-free components, this replacement set stands up to daily use. Dishwasher Safe. Easy Installation: The screw-on lid and simple straw assembly offer frustration-free replacements, getting your child's favorite cup ready in seconds. Kid-Friendly Design: Soft silicone tip is gentle on teeth, encouraging proper hydration while adding a fun, vibrant element to everyday drinking.