This pack contains MCPCBs , Driver, Housing , micro screws, You can make 10 LED Bulbs It is an IC based HPF Driver with PF 0.95, and MCPCB has 100 Lumens per Watt. Driver has a stand-by up to AC 440V. Housing is Aluminium coated so it will absorb heat and increase the life of bulb upto ten (2) years. So you can give 2 year warranty on the bulbs assembled by this raw Material.