Constructed of 100% food grade 18/18 stainless steel these straws are guaranteed to last a life time. They have a thicker wall than many of the inexpensive stainless straws in the market place. Lastra puts their straws through two additional steps in the manufacturing process, sanding and then polishing the tips. This ensures their safety and comfort with use. All of the straws in the Strå Sets have a titanium coating on the exterior which gives them their color. The titanium is also a harder surface than plain stainless.