1. Premium and Reusable Material: These straws are made of food grade borosilicate glass, lead-free and BPA-free. They are high strength, rigidity, hardness, and good resistance to grinding. Therefore, there will be no metallic taste in your drink, nor will it leave any aftertaste from your last drink. 2. Ideal Size for Various Drinks: Suitable for mason jar glasses, various glasses, bar glasses, and more glass cups. Perfect match for various drinks like: smoothies, milkshakes, water, coffee, hot/iced tea, milk, and cocktails. 3. Easy to Clean: Easy-to-clean straw brush easily penetrates the entire wall of the clear straw. They are also dishwasher safe due to the high borosilicate glass material. 4. Please note that the glass drinking straw has a certain hardness, but it may still break if dropped on the ground.