2L hasl SMT circuit board 1.Made in China 2..experience8 years ... mask hardness 6H6H6H surface plating Carbon ink,Peelable S/M,HASL(lead free),Immersion silver/tin,Color Green ,yellow, blue ,red ... mask hardness 6H6H6H surface plating Carbon ink,Peelable S/M,HASL(lead free),Immersion silver/tin,Color Green ,yellow, blue ,red ...