The silicone straw is made of silicone. Straw Size:9 41/64 inch Length, diameter approx:7/16 inch. A variety of colors give you a special experience. 100% reusable food-grade silicone material, eco-friendly, non-toxic, tasteless, dishwasher safe but can not be used in microwave. Silicone straw is ideal for smoothies, coffee, tea, holiday cocktails, etc; Can be folded, easy to store. 1 31/32" D x 25/32" H