Kostecsys Co.,Ltd is a specializing in the manufacture of Metal PKG for High power laser diode stem , C-mount block , CCP ...In addition to KOSTEC SYS manufacture AuSn LID , AgCu ( Direct Seam ) Lid , Cavity Lid for SMD RF/ IF Filter .KOSTECSYS not only will provide what customers wants interms of price, quality, applications engineering , customer service but also elevate its corporate ethics and transparency to global standards as the true global leader in the IT component field of the 21st century. Wish every success in your work and business and all happiness in your family.