Size Compatibility: Designed for Stanley large straws with a 0.4 inch/10mm diameter. Ensure compatibility with other brands or sizes by checking dimensions before purchase. High-Quality Silicone: Crafted from BPA-free, soft, and durable silicone, these straw caps are safe, non-toxic, and reusable. Both hand washable and dishwasher safe for easy maintenance. Easy and Secure Application: Easily fix these straw plugs directly onto straws, providing a secure fit to prevent contamination by dust, spittle, or insects. Maintains hygiene for both straw and cup. Portable Hygiene Solution: Carry this straw lid kit wherever you go, perfect for outdoor activities like camping, hiking, or daily walks. Keep your straws and drinks clean on the move. Cute Animated Styles: The package includes 13 different shapes of silicone straw caps with creative cartoon designs. A decorative and adorable addition to your straws, making it a perfect gift for friends and family.