Hi Everyone, SHIPPING DISCOUNTS FOR MULTI ITEM PURCHASE!!! Buy one item and pay shipping the rest of your items will ship FREE!!! >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>PERFORMANCE BOOSTING TECHNOLOGY<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< This sale is for your choice of 20mm, 16mm or 10mm COPPER PCBs. These are bare stars no LEDs are included. Available emitter foot prints: Cree XML, XML2 Cree XPG, XPG2, XPG3, Nichia 219 Cree XHP50 Cree XHP70 These copper core PCBs significantly boost the performance of LEDs. The direct thermal path technology makes it possible to drive the emitter much harder than factory specification. The emitter is soldered DIRECTLY to the copper heat pad. . These are high quality, and preform well above standard aluminum MCPCBs. Boards that simply use copper for the base and retain use of the crystal substrate layer in the center will not give you the same performance. Using these stars in combination with PROPER heat sinking emitters can be driven to significantly higher than rated capacity. Output Gains are seen even at DOUBLE the rated drive current of emitters. Output increases are also achieved at some standard currents. Output graphs compare standard MCPCB with copper MCPCB in controlled test (graphs thanks to BLF member Match). How to Reflow Solder HERE Please see my other listings for these with emitters, and other great flashlight related items.