Each straw is handmade in our studio by glass artists and free of Chinese glass or materials. Certified BPA & Lead-free premium glass. Plastics contain a very dangerous chemical called Bisphenol A (BPA), which has been linked to hormonal disruption, obesity, early puberty, as well as breast and prostate cancers. The coloring in plastic straws is also poisonous. Our glass straws are 100% non-toxic and will not cause any health problems. In the U.S. we use over 500 million plastic straws DAILY. Plastic is not biodegradable, meaning every plastic straw used since they were invented in 1938 is still around in some form, leaching toxic chemicals into the water and soil. The good news is that just one person switching to a Hummingbird Glass Straw can keep about 38,000 nasty plastic straws out of the environment forever! Remember those nearly indestructible Pyrex bowls and plates your mother and grandmother had? These are made of the exact same stuff! Naturally clear, this borosilicate glass is extra strong, making it both durable and safe to drink from. Simply rinse them out after every use and you're ready to go. However, we do include a cleaning brush just in case you get a chunk of fruit from your smoothie wedged in there. Hummingbird Glass Straws are dishwasher safe, also… it doesn't get any easier than that! Don't contribute to pollution and risk your health by using plastic straws—get a Hummingbird Glass Straw 4-pack today! Satisfaction guaranteed or your money back.