Howie Buttons / 15mm / Set of 6 Merchant & Mills $4.95 Default Title - $4.95 Quantity This product is currently sold out. Please fill in the form below if you'd like to be notified when it becomes available. 4 hole corozo button, 15mm. Corozo is a 100% natural product which is similar in consistency to a hard resin. It is made up of a very tightly wound organic fibers which give it excellent durability and scratch resistance.