We recommend our insulated copper tube : Single: 1/4" ,3/8", 1/2", 5/8",3/4",7/8"Pair: 1/4"&3/8"; 1/4"&/2", 1/4"&5/8",3/8"&5/8", 3/8"&3/4" Copper tube: EN12735-1 ,; JIS H3300 PE insulation material: Class M1 France; JIS A 9511(PE-CP2)Length : 3m,4m,5m,7.5m,10m,15m,20m,30m in roll . Packing: Carton (5 layers )