This is a custom PCB manufacturer named Shenzhen Yuwei Electronic Co., Ltd. in Shenzhen city , Guangdong province , China . We are dedicated to developing and manufacturing multilayer and high precision PCB. 4-30-layer PCB in the past 15 years. Factory area is about 10000 square meters .with about 500 professional staff members., we could be strongly focusing on quality, cost, service and continuous growth. Prototype or small or medium-sized volume of 4-30 layers PCB and quick-turn as well as advanced surface treatment technology is where we can provide huge advantage. We have succeeded in passing the certifications of ISO9001 Quality Management System, UL and ISO14001 Environmental Quality System. T he best quality, the lowest cost & the promptest delivery" is our target, which enables us to be your best partner in business. We believe that we will continue to develop hand in hand with our valuable customers. Technidal parameter Min Line Width/Gap: 3.5/4mil Min Hole Size: 0.15mm for mechanical drill 0.1mm for Laser drill Min Annular Ring: 4mil Min Copper Thickness: 12OZ Finished maximum size: 2 layers:600mm*1500mm Multi-layers:500mm*1200mm Board Thickness: 2 layers:0.2-7.0mm Multi-layers: 0.4-7.0mm Min Solder Mask Bridge over 0.08mm Aspect Raion 15:1 Plugging Vias Capability: 0.2-0.8mm ENIG: AU---1-10u" Gold Finger: AU---1-120u" Platting Gold: AU---1-3u" 4Hard Gold: AU---1-150u" Ni Thickness: 50-500u" Ni-Pb-Au: Pb---2-5u, Au---1-8u"