These are double flared 4g 5MM guage tunnels exactly the same style as the ones seen in the picture. THESE PINK BLING BLING TUNNELS ARE A GREAT ITEM TO WEAR OUT ON A NIGHT ON THE TOWN.  The back is held on with by a threaded nut. The material is 316L surgical steel. 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. 933C