MADE OF A TOUGH POLYMER CORE COVERED WITH BRAIDED STAINLESS STEEL WIRE THESE CONNECTORS EXCEED EVERY CODE REQUIREMENT IN THE BOOK FOR DURABILITY. THEY ALSO HAVE A LARGE INSIDE DIAMETER FOR HIGHER FLOW CAPACITY. EXCEPTIONAL FLEXIBILITY FOR FAST EASY INSTALLATION. WON'T KINK OR CREASE EVEN IN THE TIGHTEST OF SPACES. HEAVY-DUTY BRASS HEX NUTS ARE EASY TO GRIP AND NICKEL PLATED FOR DURABILITY. EXCEEDS ALL CODE REQUIREMENTS FOR FLEXIBLE WATER CONNECTORS. THIS PRODUCT IS PROHIBITED FROM SHIPPING TO CALIFORNIA.