These #10 envelopes are made from a combination of (1) 1005% post-consumer recycled paper, processed chlorine-free and (2) a minimum of 5% cofee fibre. Box of 100. Made in Costa Rica. A percentage of each sale goes to support sustainable agriculture in the tropical rainforest. Security envelopes. Eco categories: Recycled, agricultural, 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.