These are double flared 4G 4 guage (5mm) BLACKLINE (TITANIUM COATED) ROUNDED ENDS TUNNELS exactly the same style as the ones seen in the picture. THEY ARE ROUNDED ON BOTH SIDES.  THEY LOOK REALLY COOL WHEN THEY ARE IN.  THE BACKS ARE THREADED ON THESE. The material is 316L surgical steel WITH THE TITANIUM COATING. A PAIR LIKE THIS WOULD GO FOR MORE THAT $50.00 AT ANY STUDIO. THIS AND ALL MY JEWELERY IS NEW AND HAS NEVER BEEN WORN. THE PICTURE DOES NOT DO THIS PIECE JUSTICE. SHIPPING IN A PADDED MAILER.  THANKS AND HAPPY BIDDING. 747c