... and fast delivery for your reference. DescriptionDetails SpecificationBase MaterialFR-4,Aluminium-backed board,Halogen-free,Lead-free compatible,High Tg, ... 210um12-210umMin.Annular ring0.10mm0.08mmMin.solder mask clearance0.05mm0.05mmMin.solder mask clearance0.045mm0.03mmImpedance tolerance±10 ... ,Flash golds,ENIG,OSP(lead freecompatible),Carbon ink,Peelable S/M,HASL(lead free),Immersion silver/tin,Gold ...