Dear Sir   Good day！ I am Lee from TAILI-PCB. This is our product introduction. pls check. 4 layer HIGH TG RF PCB Product parameters Layer: 4 Board Thickness(mm): 1.600 Copper Thickness(oz): 1 Surface Treatment: LF HAL Dimensional Tolerances(mm): 0.13 Solder Mask: TOP Red BOT Red Silk Screen: TOP White BOT White Test: Flying Min Width(mil): 2.8 Min Spacing（mil): 3.8 Min Hole Diameter(mm): 0.5 Aspect Ratio: 3.2 TG: 170 If you need anything, please contact me . Best regards Lee   Tel : 0086-0755-83264277 Email : lee@taili-pcb.com     Website: www.taili-pcb.com Skype: TAILI-PCB Lee ISO 9001:2008 + ISO 14001:2004 Sira Certification UL:E525352  PThink Green! Before printing this e-mail.This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is strictly forbidden.