Made of borosilicate glass tubing which is the strongest commercially available glass. This is the same glass that Pyrexﾃつｮ is made from;Quality Straws - Each straw is handmade in our studio by glass artists and inspected by hand for quality;Lead Free - So you can feel confident when drinking hot or cold liquids that no toxins are leaching into your beverage;Easy to Clean - Simply rinse the straws after use or place in the dishwasher;Lifetime Guarantee - If you're not completely satisfied simply let us know and we will offer a prompt refund or replacement, no questions asked