Check the listing for details. RIBCAGE AIR BACKBONE C/CS MOUNT W/ 3DR MODIFIED GOPRO HD HERO4 6mm SILVER CAMERA. Condition: Used. Listed at 519.99 USD. 1- HERO4 SILVER WITH RIBCAGE AIR PROFESSIONALLY INSTALLED BY THE PRO'S AT RAGECAMS.USE C/CS & M12 LENSES ON THIS KIT. 6mm lens installed.DescriptionConnect Your own lenses to GoPro Hero4 Silver with our new Ribcage air mod kit! The Ribcage by Backbone is a mod that allows users to connect any M12, CS-Mount or C-Mount lens to their hero4 camera. By means of readily available adapter rings, any manual lens may be attached, including those from popular manufacturers such as Canon, Nikon and Pentax!.aucCounter a { text-decoration:none; }.aucCounter span:hover { text-decoration:underline; }.aucHiddenCounter { display:none; }.aucCounterOrangeText { color:#FB6D05; font-family:Arial; Font-size:13px; Font-weight:bold; }.aucCounterBlueText { color:#0068ac; Font-family:Arial; Font-size:11px; } Track Page Views WithAuctiva's FREE Counter