1.Reusable & Premium Material - These straws are made of food grade high borosilicate glass, Lead and BPA free. Be high strength, stiffness, hardness and good resistance to mill. Thus, there will be no metallic taste in your drink, no leave aftertaste from your last drink. 2.Ideal Size For Various Drink - Suitable for mason jar cup, various tumblers, bar glass and more glass cup. Perfect match for various beverages such as : smoothies, milk shake, water, coffee, hot/ice tea, milk and cocktails. 3.Easy to Clean - Easy to clean straw brush that easily penetrate the entire wall of the clear straw. They are also be dishwasher safe due to high borosilicate glass material. 4.Please note that the glass drinking straw has a certain hardness, but it still can be broken if dropping on the ground.