Janya Extrusions Pvt. Ltd. Manufactures Copper Tubes for Heavy Engineering and Electrical Purpose. Janya Extrusions Pvt. Ltd. Is an ISO 9001:2000 certified company. The company also manufactures copper products, like, various types of copper capillary tubes, brass rounds, and copper rounds. Copper Tubes for Heavy Engineering and Electrical Purpose are available in any grade with a maximum wall thickness of 25 mm and with a single piece weight of 105 kg or more and with high conductivity also.