RAW MATERIAL - AISI 42 GRADE MEDICAL STAINLESS STEEL RAW MATERIAL SOURCE - GERMANY USA AND JAPAN NEEDLE LENGTH - FROM 8 MM TO 90 MM NEEDLE CURVATURE - 12 CIRCLE , 38 CIRCLE, 58 CIRCLE , J CURVE & STRAIGHT NEEDLE DIAMETER - FROM 0.34 MM TO 1.35 MM FINISHING - RIBBED AND SILICONIZED