Silistraws The Siliskin Reusable Straws are 100% silicone and come in different lengths providing an option for different height cups. Perfect for any size cup! Comes in pack of 6 with three different sizes. Easy to use and keep clean. Also the perfect compliment to the Siliskin Straw Tops! Time to GoSili. We love stainless steel straws as much as the next person, but we don't love banging them against our teeth. Our silicone straws are nontoxic, flexible, safe for teeth.