Also available as a pack of 50, SKU - CU-SU-12C-P. Pairs with lids - CUL-CS-12F and CUL-FB-12F-LF. World Centric 12 oz NoTree bamboo cold cups are made from 100% bamboo paper, meaning no trees were cut down to make them. These cups are unbleached, and have a bio-based lining. The use of bamboo paper in place of traditional paper helps preserve our dwindling forests and the wildlife and indigenous communities that rely on them. Not microwavable. They are certified compostable in a commercial facility, which may not exist in your area.