I have no idea what type paper it is, I know that it is definetly an art. I take a small flat watercolor paint brush, dip it in to full strength FO. Lay the brush on to the air freshener (over and over until both sides are coated) they are extremely absorbent. It depends on the scent( what else is new, LOL) how long they last. Mine in my SUV last a couple of months, then I refresh them. The blanks are still absorbent. The branding iron came from Custom branding Irons,LLC. I also found that with google. It's fun, I probally could have used a rubber stamp. I just wanted one to use for different applications. Plus FO deteriorates ink sometimes. We'll see how it goes... :)Kyme