... got the CE certificate and pass the Rohs test! 1,Copper tube:O.D.1/4''&3/8'',1/4''&1 ... '',3/8''&3/4'',1/2''&3/4''2,Copper tube:thickness from 0.5mm to 1.5mm.3,Length: 3 meters ... B280,JIS H3300 C1220T,EN12735-1, AS 15715,Thickness of copper tube compatible any gases:R22,R407C,R410A,R404A,R507C etc ... water absorption9,Insulation pipe can be printed with letter. Insulated copper pipe(tube)