These stickers are printed on an eco-friendly material called Fiberstone Paper, at a local sticker shop right here in Fort Collins, CO. Fiberstone Paper consists of 80% calcium carbonate, which is a base mineral and inorganic compound and 20% polyethylene resin to create an environmentally friendly paper. Fiberstone Paper is water- resistant and inherently strong and durable. Actual colors may vary from the photo.