... DescriptionDetails SpecificationBase MaterialFR-4,Aluminium-backed board,Halogen-free,Lead-free compatible,High Tg,High CTI,CEM-1,CEM-3 ... -210um12-210umMin.Annular ring0.10mm0.08mmMin.solder mask clearance0.05mm0.05mmMin.solder mask clearance0.045mm0.03mmImpedance tolerance±10%± ... typeHASL,Flash golds,ENIG,OSP(lead freecompatible),Carbon ink,Peelable S/M,HASL(lead free),Immersion silver/tin,Gold finger ...