YOLLY|Natural Bamboo Fiber Straw|Plant Fiber International Inc. YOLLY Natural Bamboo Fiber Straw is the most eco-friendly straws in the world. 100% Natural Bamboo Fiber, Plastic-Free, Biodegradable, Combustible, Chemical-Free, Made in Taiwan. With more than 30 years of experience in plant fiber dry processing and forming technology, we have created the most natural and eco-friendly material, the unparalleled disposable straw solution.