Vintage Conn "Steelay" Hard Rubber Mouthpiece.  Tip opening is a 5. As the photos tell this mouthpiece is in great physical condition for its age, still sporting its original paint on the logo.  These mouthpieces have a large chamber and take the air well.  Tip and rails are original and show no signs of trauma.  I was keeping around to reface but am clearing out some gear and selling it as is.  No case, I will pack to ensure safe delivery.