These #10 envelopes are made from a combination of (1) unbleached post-consumer paper and (2) a minimum of 5% banana fibre. Box of 25. Very colorful (on back side. Security envelopes. Made in Costa Rica. A percentage of each sale goes to support sustainable agriculture in the tropical rainforest. Eco categories: recycled, less toxic. Please note that these were a special purchase of a discontinued item and that while the envelopes are very strong and sturdy they do not seal well - they need a glue stick or they need to be taped.