The nickel sleeves,which are researched and developed by Japanese manufacture for high-performance, low-cost optical components, can substitute for the copper sleeves and ceramic sleeves.The Japanese nickel sleeves successfully pass the strict Plug In and Out Test in 2000 times, Salt Spray Test, the safety and environment laws (RoHS), and so on…. The test series described here shows that the Nickel sleeve's performance offers the same level of insertion loss, withdrawal force, durability, and reliability as the zirconia sleeve. Further, this new Japanese sleeve type is suitable for both single mode and multimode applications. Now, many local famous and big makers start to use nickel sleeves. Because it helps our customers promote the worldwide market, we are glad to announce this material replacement to all of our customers.