Features: new and high quality They are able to fit any standard size water bottles and even some beer bottles which makes them instantly leakproof. Also can use these with reusable straws by sliding one into the top of the spout. Simply push the cap into the bottle and until its a tight and open the top of the cap. Made of fine quality silicone material, flexible, reusable and durable for long term use. 3 bright colors to choose from, these silicone bottle caps make a fun and practical addition to any home bar or kitchen. Specifications: Material: Silicone Size: approx.5 x 5.5cm or 1.97x2.16in Optional Color: Red, Green, Blue Quantity: 1 Pc Note: Please allow 0-1cm error due to manual measurement. please make sure you do not mind before you bid. Due to difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 x Bottle Tops Spout