G-Cap Spill Proof, Straw Bottle Top Covers--2 Pack quickly and conveniently turns any beverage bottle into a kid friendly bottle by stopping spills. No more mess in the car, no more wasted drinks, no more meltdowns and not more sippy cups need. Itís easy to use! Itís safe! Itís easy to clean! Purpose: Universal bottle topper to eliminate drink spills. Material: Thermoplastic elastomer (TPE) similar characteristic as silicone. Made in New Jersey, USA with us materials.